core: Reduce array visibility of ContextMappers

Reduced the visibility of array "constants" to solve MS_PKGPROTECT
FindBugs warnings in these classes.

Change-Id: Iabdebea8667b9e7e6137cdf8d024f837d4a6b0d2
Signed-off-by: Allon Mureinik <amureini@redhat.com>
core: broad catch in LdapTemplateWrapperFactory

Replaced a catch (Exception e) clause with a series of piped catches
that cover all the exceptions that can be thrown in this block.

Besides being a good defensive practice and cleaning up the code, this
patch solves the REC_CATCH_EXCEPTION FindBugs warning for this block.

Change-Id: Iea983982865d740d2ca0a852454931fb0de0ed8c
Signed-off-by: Allon Mureinik <amureini@redhat.com>