Updated versions for 2.2.3 release and other minor enhancements

[wing328]

PR checklist

• Read the contribution guidelines.
• Ran the shell script under ./bin/ to update Petstore sample so that CIs can verify the change. (For instance, only need to run ./bin/{LANG}-petstore.sh and ./bin/security/{LANG}-petstore.sh if updating the {LANG} (e.g. php, ruby, python, etc) code generator or {LANG} client's mustache templates). Windows batch files can be found in .\bin\windows\.
• Filed the PR against the correct branch: master for non-breaking changes and 2.3.0 branch for breaking (non-backward compatible) changes.

Description of the PR

• updated versions for release 2.2.3
• add header support to qt5 C++
• remove .travis.objc_swift_test.yml as it's no longer needed
• update Java client version in config-help

[wing328]

I'll need to rollback the build image to xcode8.2 as xcode9 does not have the ruby version we've been using.

[wing328]

Travis tests passed via https://travis-ci.org/swagger-api/swagger-codegen/builds/253948678?utm_source=github_status&utm_medium=notification

[fehguy]

Thanks @wing328. I have to do one last update to address a vulnerability in jackson used in swagger-core. Any concerns about the travis PR failing?

[wing328]

Duplicated Travis jobs were created: 1 passed while the other failed with the following reason:

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-deploy-plugin:2.7:deploy (default-deploy) on project swagger-codegen-project: Failed to deploy artifacts: Could not transfer artifact io.swagger:swagger-codegen-project:pom:2.2.3 from/to sonatype-nexus-staging (https://oss.sonatype.org/service/local/staging/deploy/maven2/): Failed to transfer file: https://oss.sonatype.org/service/local/staging/deploy/maven2/io/swagger/swagger-codegen-project/2.2.3/swagger-codegen-project-2.2.3.pom. Return code is: 401, ReasonPhrase: Unauthorized. -> [Help 1]

Looks like it's related to the deployment of the snapshot:

  - if [ $SONATYPE_USERNAME ] && [ -z $TRAVIS_TAG ] && [ "$TRAVIS_BRANCH" = "master" ]; then
      mvn clean deploy --settings .travis/settings.xml;
      echo "Finished mvn clean deploy";
    fi;

Given another job passed, I wouldn't worry too much and we can dig deeper into the 401 unauthorized issue later.