[JAVA] When using msf4j generation with dateLibrary=java8 joda-time is still referenced and used

Description

As @wing328 suggested, I'm opening a separate issue ticket for this problem regarding msf4j java8 time generation.

Basically, it's the same as discussed in #2874 and #4705.
I try to generate msf4j server with -DdateLibrary=java8 and it's still references and uses joda-time.

Swagger-codegen version

2.2.3-SNAPSHOT

Command line used for generation

java -jar ~/workspace/Ghost93/swagger-codegen/modules/swagger-codegen-cli/target/swagger-codegen-cli.jar \
	generate --template-dir ~/workspace/Ghost93/swagger-codegen/modules/swagger-codegen/src/main/resources/MSF4J \
	--input-spec ./swagger.yaml \
	--lang msf4j \
	--output ./ \
	--artifact-id MyService \
	--group-id com.github.ghost93 \
	--invoker-package com.github.ghost93.api \
	--api-package com.github.ghost93.api \
	--model-package com.github.ghost93.model \
	--artifact-id MyService \
	-Dtitle=MyService

Reproduce the reported generation command with the MSF4J template directory and dateLibrary=java8, then inspect the generated server project's references to joda-time. Done means the generated MSF4J output uses Java 8 date handling without retaining joda-time references.