Fix acceptance testing on osx

Author: DavidS

.sync.yml

@@ -21,9 +21,9 @@
     env: PUPPET_GEM_VERSION="~> 6.0" CHECK=parallel_spec
     rvm: 2.5.3
     stage: spec
-  - bundler_args:
-    os: osx
-    rvm: 2.5.1
+  - os: osx
+    bundler_args: --with system_tests
+    rvm: 2.5.3
     before_script:
     - brew update
     - brew install openssl

.travis.yml

@@ -105,9 +105,9 @@ jobs:
       stage: spec
     -
       before_script: ["brew update", "brew install openssl", "bundle exec rake spec_prep"]
-      bundler_args: 
+      bundler_args: --with system_tests
       os: osx
-      rvm: 2.5.1
+      rvm: 2.5.3
       script: ["bundle exec rake litmus:acceptance:localhost"]
       stage: acceptance
 branches: