Specify older fixtures for Puppet 3 tests

refs voxpupuli#286

.fixtures.puppet3.yml

@@ -0,0 +1,14 @@
+# Version compatibility for Puppet 3
+fixtures:
+  forge_modules:
+    stdlib: "puppetlabs/stdlib"
+    concat:
+      repo: "puppetlabs/concat"
+      ref: "2.2.1"
+    apt:
+      repo: "puppetlabs/apt"
+      ref: "2.4.0"
+    chocolatey: "puppetlabs/chocolatey"
+    zypprepo: "darin/zypprepo"
+  symlinks:
+    icinga2: "#{source_dir}"

.travis.yml

@@ -27,13 +27,13 @@ matrix:
   - rvm: 2.1.10
     env: PUPPET_VERSION="~> 4.0" CHECK=test PARALLEL_TEST_PROCESSORS=4
   - rvm: 2.1.10
-    env: PUPPET_VERSION="~> 3.8" STRICT_VARIABLES="yes" FUTURE_PARSER="yes" CHECK=test
+    env: PUPPET_VERSION="~> 3.8" STRICT_VARIABLES="yes" FUTURE_PARSER="yes" CHECK=test FIXTURES_YML=.fixtures.puppet3.yml
   - rvm: 2.1.10
-    env: PUPPET_VERSION="~> 3.8" STRICT_VARIABLES="yes" CHECK=test
+    env: PUPPET_VERSION="~> 3.8" STRICT_VARIABLES="yes" CHECK=test FIXTURES_YML=.fixtures.puppet3.yml
   - rvm: 1.9.3
-    env: PUPPET_VERSION="~> 3.8" STRICT_VARIABLES="yes" CHECK=test
+    env: PUPPET_VERSION="~> 3.8" STRICT_VARIABLES="yes" CHECK=test FIXTURES_YML=.fixtures.puppet3.yml
   - rvm: 1.9.3
-    env: PUPPET_VERSION="~> 3.8" STRICT_VARIABLES="yes" FUTURE_PARSER="yes" CHECK=test
+    env: PUPPET_VERSION="~> 3.8" STRICT_VARIABLES="yes" FUTURE_PARSER="yes" CHECK=test FIXTURES_YML=.fixtures.puppet3.yml
   allow_failures:
     - rvm: 2.4.0
 branches: