Update build to use Go 1.15

Signed-off-by: Matthew Sykes <sykesmat@us.ibm.com>

Makefile

@@ -77,7 +77,7 @@ METADATA_VAR += CommitSHA=$(EXTRA_VERSION)
 METADATA_VAR += BaseDockerLabel=$(BASE_DOCKER_LABEL)
 METADATA_VAR += DockerNamespace=$(DOCKER_NS)
 
-GO_VER = 1.14.12
+GO_VER = 1.15.7
 GO_TAGS ?=
 
 RELEASE_EXES = orderer $(TOOLS_EXES)

ci/azure-pipelines-merge.yml

@@ -11,7 +11,7 @@ pr: none
 variables:
   GOPATH: $(Agent.BuildDirectory)/go
   PATH: $(Agent.BuildDirectory)/go/bin:/usr/local/go/bin:/bin:/usr/bin:/sbin:/usr/sbin:/usr/local/bin:/usr/local/sbin
-  GOVER: 1.14.12
+  GOVER: 1.15.7
 
 jobs:
   - job: UnitTests

ci/azure-pipelines-release.yml

@@ -11,7 +11,7 @@ variables:
   - name: GOPATH
     value: $(Agent.BuildDirectory)/go
   - name: GOVER
-    value: 1.14.12
+    value: 1.15.7
 
 stages:
   - stage: BuildBinaries

ci/azure-pipelines.yml

@@ -11,7 +11,7 @@ pr:
 variables:
   GOPATH: $(Agent.BuildDirectory)/go
   PATH: $(Agent.BuildDirectory)/go/bin:/bin:/usr/bin:/sbin:/usr/sbin:/usr/local/bin:/usr/local/sbin
-  GOVER: 1.14.12
+  GOVER: 1.15.7
 
 stages:
   - stage: VerifyBuild

ci/install_deps.yml

@@ -14,4 +14,4 @@ steps:
     inputs:
       version: $(GOVER)
       goPath:  $(GOPATH)
-    displayName: Install GoLang
+    displayName: Install Go

docs/source/dev-setup/devenv.rst

@@ -5,7 +5,7 @@ Prerequisites
 ~~~~~~~~~~~~~
 
 -  `Git client <https://git-scm.com/downloads>`__
--  `Go <https://golang.org/dl/>`__ version 1.14.x
+-  `Go <https://golang.org/dl/>`__ version 1.15.x
 -  `Docker <https://docs.docker.com/get-docker/>`__ version 18.03 or later
 -  (macOS) `Xcode Command Line Tools <https://developer.apple.com/downloads/>`__
 -  `SoftHSM <https://github.com/opendnssec/SoftHSMv2>`__

vagrant/golang.sh

@@ -5,7 +5,7 @@
 # SPDX-License-Identifier: Apache-2.0
 
 GOROOT='/opt/go'
-GO_VERSION=1.14.12
+GO_VERSION=1.15.7
 
 # ----------------------------------------------------------------
 # Install Golang