Added Groovy Eclipse compiler to master pom. (#1141)

Groovy Eclipse compiler is missing in the master pom and .groovy tests can not
be executed without additional configuration.

I have added some workarounds to the Systeminfo binding and Max binding in order to
execute Groovy tests with #772 and #785, but I think it makes more sense
to move the Groovy Eclipse compiler to the master POM, so new test bundles can use it (like in the
ESH repo).

I took as an example the .pom file from the ESH repo.

Signed-off-by: Svilen Valkanov <svilen.valkanov@musala.com