* remove http signature from test yaml when not supported
* do not use HttpBearerAuth for signature auth or other unsupported http auth method
ignore unsupported http auth method unless generated code would not compile (in which case, an exception is thrown)
* [Java] fix use of isBasic condition
* [kotlin] fix use of isBasic condition
* remove import mapping logic in model generation, better handle of file, list
* add new files for file, list
* fix some tests
* update tests, doc
* skip file as reserved word in feign client
* add new files
* remove file from reserved word list in spring generator
* Build sample prior to code changes so differences are easier to decipher
* Add byte array type adapter for okhttp-gson (java8 only)
* Unit revealed that Gson (or GsonFire) defaults to escape = (equal sign) out of base64 string. Add disableHtmlEscaping() to gsonbuilder.
* Update specs and samples to include format=byte and include junit test of byte array serialization and deserialization.
* Implement recommendations by @cbornet including: Use okio.ByteString for base64 conversions instead of java 8 lib since the okhttp-gson client already includes okio. Remove setting to disableHtmlEscaping. Rename LocalByteArrayAdapter to ByteArrayAdapter.
* Update spec and sample for java okhttp-gson library client
* Undo addition of profilePhoto property. A format byte property is already available under the format_test definition.
* Put previously deleted tests back. Modified testFindPetsByTags() to verify exception since the server now returns a 500 for this request.
* Update test to pass when run against docker containerized server swaggerapi/petstore (heads up, this test fails if calling out to the internet published version of http://petstore.swagger.io)
by fixing the logic of enum Boolean checking.
Other changes:
* Remove the `true &&` prefix from the `equals` method in models.
* Apply some changes of Java-default to Java-okhttp-gson, i.e. adding
`this` and parent model handling.
* Some improvements on spaces and blank lines.
