ResourcesCommandEntry: fix error messages
ResourcesCommandEntry: fix error messages

Error messages were using the self.command variable that
did not exist. This commit fixes that by using the
self.broker_command.command variable instead.

Change-Id: Ia3f99a4ee8ba1549217d07d1cae524039eab97aa
Reviewed-by: Eleonore Carpentier <1b2c0730940d39a75f087f627683eb2c2dfabd1b@morganstanley.com>
Tested-by: Aquilon Template Build testing and verification
Reviewed-by: Fred Barnes <a457b66771fa7031f08927d92d89014c238c08f7@morganstanley.com>

quattor/aquilon,quattor/aquilon,quattor/aquilon