WIP: Don't yarn link @pulumi dependencies

Author: ellismg

.travis.yml

@@ -25,9 +25,11 @@ before_install:
     # Install Yarn as per https://yarnpkg.com/lang/en/docs/install-ci/#travis-tab.
     - curl -o- -L https://yarnpkg.com/install.sh | bash -s -- --version 1.2.1
     - export PATH=$HOME/.yarn/bin:$PATH
+    # Install Pulumi
+    - ${GOPATH}/src/github.com/pulumi/home/scripts/install-pulumi.sh v0.12.0
+    - export PATH=/usr/local/pulumi/bin:$PATH
     - . ${GOPATH}/src/github.com/pulumi/home/scripts/keep-failed-tests.sh
 install:
-    - ${GOPATH}/src/github.com/pulumi/home/scripts/install-locked.sh ${PULUMI_ROOT} pulumi pulumi-aws
     - make ensure
 before_script:
     # Ensure the working tree is clean (make ensure may have updated lock files)