(#9027) Get rid of spurious info messages in groupadd

Usage of the groupadd provider was leading to spurious log messages of
this form:

info: /Group[developer]: Provider groupadd does not support features
manages_aix_lam; not managing attribute ia_load_module

This was due to the ia_load_module parameter requiring manages_aix_lam
and additionally having a defaultto value of "compat."

This fix is the same as was done for the useradd provider in commit
49c5152d64bb2d73a2751e9844bb2b92b14b88eb and issue #7137.