* generate a RestResourceRoot with a string constant holding the jax-rs resource root to be used in the @ApplicationPath annotation to make it easier for people, who want to write their own jax-rs Application class
* build and update samples as per PR guide
* renamed introduced constant from ROOT to APPLICATION_PATH to make its use more obvious
* Adds "useTags" option to all jaxrs code generators (AbstractJAXRSServerCodegen):
- jaxrs-jersey
- jaxrs-spec
- jaxrs-cxf-cdi
- jaxrs-resteasy
- jaxrs-cxf
- jaxrs-cxf-extended
- java-msf4j
- jaxrs-resteasy-eap
* jaxrs-spec
- Changed handling of root paths: e.g "/:", "/{id}:" to simplify code and create a more consistent behaviour
-- old: use tag for classname
-- new: use tag only if useTags is enabled, use "DefaultApi" if not
* @path class level annotation
- for all generators above and the microprofile generator (uses same jaxrs postprocessing)
- extended the "commonPath" to contain more than only the root path if possible
- e.g. "/group1/subgroup1/op1" -> "/group1/subgroup1" is moved to class level annotation
* Use contextPath variable for RestApplication templates
* Update generated RestApplication.java files, as they are skipped by default otherwise
* Update Petstore sample for jaxrs so that CIs can verify the change
* sample server projects "jaxrs-spec", "jaxrs-spec-interface", and "jaxrs-spec-interface-response" should be tested
* update jax-rs api to 2.1, in which @PATCH annotation is available
add jackson annotation dependency
* add joda-time to dependency
* modify mustache template to add @JsonCreate, @JsonValue import
* fix return type of enum value() method
* add InputStream import
* Attachment class is in apache cxf. spec should not depend on it
* re-generate sample jaxrs-spec, jaxrs-spec-interface, and jaxrs-spec-interface-response
* Issue 7440 Added support for returning response in jaxrs-spec interfaces.
* Issue-7386 Updates samples for jaxrs-spec interfaces introduced in issue 7386.
