pgAdmin 4 commit: Do not need to implement the BackendSupported functio

Do not need to implement the BackendSupported function in resource
group, we do have the same function in CollectionModule class, which
will work, when we set the min_ver, max_ver and server_type properly.

Thanks Khushboo for pointing that out, and Akshay for quick testing for
this patch.

Branch
------
master

Details
-------
http://git.postgresql.org/gitweb?p=pgadmin4.git;a=commitdiff;h=6c2faa984b293c644788234523f56c586e1bd6aa

Modified Files
--------------
.../servers/resource_groups/__init__.py            | 26 +++-------------------
1 file changed, 3 insertions(+), 23 deletions(-)