fixes issue where the bgp peer-group name was not parsed
fixes issue where the bgp peer-group name was not parsed

This commit fixes a minor issue with parsing the current configuration to
obtain the bgp peer-group name.  Once applied, the bgp api module will now
correctly parse the configuration

mitchmahan/pyeapi,SivagnanamCiena/pyeapi,jerearista/pyeapi,arista-eosplus/pyeapi,mzbenami/pyeapi,devtodor/pyeapi-py3