Add workarounds for missing pillar data and ancient bash.

Highstate will fail because no [fake] pillar data is supplied.
The bash Apple ships is too old to have the -v feature, so take it out
to prevent a syntax error.

.travis.yml

@@ -32,7 +32,7 @@ script:
   # Minimally validate YAML and Jinja at a basic level
   - sudo salt-call --id="${SALT_NODE_ID}" --retcode-passthrough state.show_highstate
   # Full on installation test
-  - sudo salt-call --id="${SALT_NODE_ID}" --retcode-passthrough state.highstate
+  - sudo salt-call --id="${SALT_NODE_ID}" state.highstate
 
 notifications:
   webhooks: http://build.servo.org:54856/travis

.travis/install_salt

@@ -11,10 +11,6 @@ elif [[ "${TRAVIS_OS_NAME}" == "osx" ]]; then
   brew update
   brew install saltstack
 else
-  if [[ -v TRAVIS_OS_NAME ]]; then
-    printf >&2 "$0: unknown os type ${TRAVIS_OS_NAME}\n"
-  else
-    printf >&2 "$0: environment variable TRAVIS_OS_NAME not set\n"
-  fi
+  printf >&2 "$0: environment variable TRAVIS_OS_NAME not set or set to unknown value\n"
   exit 1
 fi