Remove oraclejdk7 from travis build
Remove oraclejdk7 from travis build

oraclejdk7 is no longer supported by Oracle and openjdk7 is pretty
similar.

googleapis/google-http-java-client,ejona86/google-http-java-client,googleapis/google-http-java-client,googleapis/google-http-java-client,ejona86/google-http-java-client,ejona86/google-http-java-client,googleapis/google-http-java-client