Switch to new trySlackSend function

Switch all slackSend calls to trySlackSend.   Fixes errors like these
when the Slack Notification Plugin is not configured:

      java.lang.NoSuchMethodError: No such DSL method 'slackSend' found

Signed-off-by: Geoff Levand <geoff@infradead.org>

os/board/sign-image.groovy

@@ -106,11 +106,7 @@ stage('Wait') {
     def msg = """The ${params.BOARD} ${version ?: "UNKNOWN"} build is waiting for the boot loader files to be signed for Secure Boot and uploaded to continue.\n
 When all boot loader files are uploaded, go to ${BUILD_URL}input and proceed with the build."""
 
-    try {
-        slackSend color: '#C0C0C0', message: msg
-    } catch (NoSuchMethodError err) {
-        echo msg
-    }
+    trySlackSend color: '#C0C0C0', message: msg
     input 'Waiting for the signed UEFI binaries to be ready...'
 }
 

os/docs-sync.groovy

@@ -176,7 +176,7 @@ git -C coreos-pages push -f ${forkUrl} ${branch}
                                         sourceBranch: branch,
                                         title: "os: sync ${version}",
                                         message: "From: ${env.BUILD_URL}"
-            slackSend color: '#2020C0',
+            trySlackSend color: '#2020C0',
                       message: "${version} (${channel}) docs: ${url}"
         }
     }

os/glsa.groovy

@@ -106,7 +106,7 @@ exit 0  # Do not return a non-zero $? from above.
         def color = readFile 'status.txt'
         def message = readFile 'notify.txt'
         if (message)
-            slackSend color: color ?: '#C0C0C0', message: """${message}
+            trySlackSend color: color ?: '#C0C0C0', message: """${message}
 Run `update_ebuilds --commit --portage=rsync metadata/glsa` in the SDK to \
 update GLSA definitions."""
     }

os/kola/aws.groovy

@@ -101,5 +101,5 @@ timeout --signal=SIGQUIT 120m bin/kola run \
 currentBuild.result = rc == 0 ? 'SUCCESS' : 'FAILURE'
 
 if (currentBuild.result == 'FAILURE')
-    slackSend color: 'danger',
+    trySlackSend color: 'danger',
               message: "```Kola: AWS-amd64-$AWS_AMI_TYPE Failure: <${BUILD_URL}console|Console> - <${BUILD_URL}artifact/_kola_temp.tar.xz|_kola_temp>\n$message```"

os/kola/do.groovy

@@ -147,5 +147,5 @@ timeout --signal=SIGQUIT 60m bin/kola run \
 currentBuild.result = rc == 0 ? 'SUCCESS' : 'FAILURE'
 
 if (currentBuild.result == 'FAILURE')
-    slackSend color: 'danger',
+    trySlackSend color: 'danger',
               message: "```Kola: DO-amd64 Failure: <${BUILD_URL}console|Console> - <${BUILD_URL}artifact/_kola_temp.tar.xz|_kola_temp>\n$message```"

os/kola/gce.groovy

@@ -104,5 +104,5 @@ timeout --signal=SIGQUIT 60m bin/kola run \
 currentBuild.result = rc == 0 ? 'SUCCESS' : 'FAILURE'
 
 if (currentBuild.result == 'FAILURE')
-    slackSend color: 'danger',
+    trySlackSend color: 'danger',
               message: "```Kola: GCE-amd64 Failure: <${BUILD_URL}console|Console> - <${BUILD_URL}artifact/_kola_temp.tar.xz|_kola_temp>\n$message```"

os/kola/oci.groovy

@@ -215,5 +215,5 @@ EOF
 currentBuild.result = rc == 0 ? 'SUCCESS' : 'FAILURE'
 
 if (currentBuild.result == 'FAILURE')
-    slackSend color: 'danger',
+    trySlackSend color: 'danger',
               message: "```Kola: OCI-amd64 Failure: <${BUILD_URL}console|Console> - <${BUILD_URL}artifact/_kola_temp.tar.xz|_kola_temp>\n$message```"

os/kola/packet.groovy

@@ -159,5 +159,5 @@ timeout --signal=SIGQUIT "${timeout}" bin/kola run \
 currentBuild.result = rc == 0 ? 'SUCCESS' : 'FAILURE'
 
 if (currentBuild.result == 'FAILURE')
-    slackSend color: 'danger',
+    trySlackSend color: 'danger',
               message: "```Kola: Packet-$BOARD Failure: <${BUILD_URL}console|Console> - <${BUILD_URL}artifact/_kola_temp.tar.xz|_kola_temp>\n$message```"

os/kola/qemu.groovy

@@ -151,5 +151,5 @@ fi
 currentBuild.result = rc == 0 ? 'SUCCESS' : 'FAILURE'
 
 if (currentBuild.result == 'FAILURE')
-    slackSend color: 'danger',
+    trySlackSend color: 'danger',
               message: "```Kola: QEMU-amd64 Failure: <${BUILD_URL}console|Console> - <${BUILD_URL}artifact/_kola_temp.tar.xz|_kola_temp>\n$message```"

os/kola/qemu_uefi.groovy

@@ -146,5 +146,5 @@ sudo rm -rf tmp
 currentBuild.result = rc == 0 ? 'SUCCESS' : 'FAILURE'
 
 if (currentBuild.result == 'FAILURE')
-    slackSend color: 'danger',
+    trySlackSend color: 'danger',
               message: "```Kola: QEMU_UEFI-$BOARD Failure: <${BUILD_URL}console|Console> - <${BUILD_URL}artifact/_kola_temp.tar.xz|_kola_temp>\n$message```"

os/manifest.groovy

@@ -287,13 +287,7 @@ do
 done
 '''  /* Editor quote safety: ' */
             }
-
-            String summary = readFile('message.txt').trim()
-            try {
-                slackSend color: '#2020C0', message: summary
-            } catch (NoSuchMethodError err) {
-                echo summary
-            }
+            trySlackSend color: '#2020C0', message: readFile('message.txt').trim()
         }
     }
 }

os/nightly-build.groovy

@@ -8,10 +8,10 @@ stage('Downstream') {
     def run = build job: 'manifest', propagate: false
 
     if (run.result == 'SUCCESS')
-        slackSend color: 'good',
+        trySlackSend color: 'good',
                   message: ":partyparrot: The nightly OS build succeeded!\n${BUILD_URL}cldsv"
     else
-        slackSend color: 'danger',
+        trySlackSend color: 'danger',
                   message: ":trashfire: The nightly OS build failed!\n${BUILD_URL}cldsv"
 
     currentBuild.result = run.result

os/tectonic-nightly.groovy

@@ -146,7 +146,7 @@ node('amd64 && docker') {
 }
 
 if (rc != 0)
-    slackSend color: 'danger',
+    trySlackSend color: 'danger',
               message: "tectonic-nightly failed!\n$BUILD_URL",
               channel: '@slowrie'