generate -D list based on the plugin is using

[juven]

for example, when using 'mvn release:prepare', I'd like to get -DautoVersionSubmodules

[edannenberg]

edannenberg@cdbd8bd is a patch that enables -D per plugin, still needs some work but as I'm not really fond of bash scripting I'll leave that to someone else. :p I left some comments in the commit.

I'm also not fond of maintaining config files so I made a little tool to generate the plugin config files. maven-bash-compgen As a result plugin config is now modular. Not a minor change, so i didn't make a pull request yet.

[Davio]

+1 to this, the one that I would like to use is -DprocessDependencyManagement=false for mvn versions:display-dependency-updates