use dependencyManagement when possible, extracted deps versions in bom

[Tcharl]

Opinionated way to clean the pom:

• dependency versions has been extracted to jhipster bom (PR coming)

• Commons Plugin configuration has been put in pluginManagement section of the pom and sorted alphabetically (at least a declaration to manage version)

• Every plugin version has its property (some were missing)

IMHO, It will also ease pom maintenance by the jhipster community: less version duplicate, Etc.

• [X ] Travis tests are green
• [X ] Tests are added where necessary
• [X ] Documentation is added/updated where necessary
• [X ] Coding Rules & Commit Guidelines as per our CONTRIBUTING.md document are followed

[murdos]

Testing with the value of skipClient (as done above on line 138) is more accurate I think, since you can generate e.g. a gateway or a monolith without the client side.

[deepu105]

@Tcharl is this ready for merge?

[jdubois]

Hold on, I still didn't find time to check this

[Tcharl]

jhipster/jhipster#100 need to be merged before.

[jdubois]

OK I'm going to try to merge this for today's release!

[pascalgrimaud]

@Tcharl : since this PR, there are some warnings in logs, specially for Microservice + Eureka. Can you have a look plz ?

[WARNING] The POM for com.github.eirslett:frontend-maven-plugin:jar:${frontend-maven-plugin.version} is missing, no dependency information available
[WARNING] Failed to retrieve plugin descriptor for com.github.eirslett:frontend-maven-plugin:${frontend-maven-plugin.version}: Plugin com.github.eirslett:frontend-maven-plugin:${frontend-maven-plugin.version} or one of its dependencies could not be resolved: Failure to find com.github.eirslett:frontend-maven-plugin:jar:${frontend-maven-plugin.version} in https://repo.maven.apache.org/maven2 was cached in the local repository, resolution will not be reattempted until the update interval of central has elapsed or updates are forced
[WARNING] The POM for org.eclipse.m2e:lifecycle-mapping:jar:1.0.0 is missing, no dependency information available
[WARNING] Failed to retrieve plugin descriptor for org.eclipse.m2e:lifecycle-mapping:1.0.0: Plugin org.eclipse.m2e:lifecycle-mapping:1.0.0 or one of its dependencies could not be resolved: Failure to find org.eclipse.m2e:lifecycle-mapping:jar:1.0.0 in https://repo.maven.apache.org/maven2 was cached in the local repository, resolution will not be reattempted until the update interval of central has elapsed or updates are forced