Support executing a maven test directly

[laeubi]

Sometime one might want to execute a single test as maven, but currently this needs to be triggered manually, it would be good to have a direct option from the menu:

this then should execute mvn test -Dtest=<name of test class>

[mickaelistria]

I would expect that the Maven test shortcut do that by default when a test class is selected.

[laeubi]

"Maven test" performs mvn test on the root pom only, as far as I can see m2e currently do not evaluates the context of the selection any further, I would even think of removing all the default shortcuts (except Maven build ...) in such a case to not overload the menu.