Use _is_this_snat_host and remove _get_gw_port_host
Use _is_this_snat_host and remove _get_gw_port_host

The _is_this_snat_host utility should be used consistently.  After
replacing a call to _get_gw_port_host with _is_this_snat_host,
_get_gw_port_host is left as just a simple helper method for
_is_this_snat_host.  The indirection is excessive and so they are
combined.

Change-Id: I880c5fdc9db9ba1304dba74a6e12f3df604793e5

wenhuizhang/neutron,mmnelemane/neutron,cloudbase/neutron,adelina-t/neutron,mahak/neutron,cisco-openstack/neutron,klmitch/neutron,igor-toga/local-snat,SamYaple/neutron,igor-toga/local-snat,openstack/neutron,shahbazn/neutron,javaos74/neutron,chitr/neutron,klmitch/neutron,vivekanand1101/neutron,swdream/neutron,silenci/neutron,openstack/neutron,vivekanand1101/neutron,yanheven/neutron,neoareslinux/neutron,JianyuWang/neutron,barnsnake351/neutron,swdream/neutron,mattt416/neutron,sasukeh/neutron,mattt416/neutron,sasukeh/neutron,cisco-openstack/neutron,eayunstack/neutron,jumpojoy/neutron,huntxu/neutron,watonyweng/neutron,takeshineshiro/neutron,paninetworks/neutron,mahak/neutron,jumpojoy/neutron,mmnelemane/neutron,wolverineav/neutron,apporc/neutron,barnsnake351/neutron,eayunstack/neutron,eonpatapon/neutron,dhanunjaya/neutron,glove747/liberty-neutron,watonyweng/neutron,noironetworks/neutron,cloudbase/neutron,suneeth51/neutron,dims/neutron,glove747/liberty-neutron,sebrandon1/neutron,jacknjzhou/neutron,apporc/neutron,chitr/neutron,takeshineshiro/neutron,dhanunjaya/neutron,asgard-lab/neutron,dims/neutron,skyddv/neutron,paninetworks/neutron,silenci/neutron,shahbazn/neutron,sebrandon1/neutron,huntxu/neutron,mahak/neutron,javaos74/neutron,noironetworks/neutron,MaximNevrov/neutron,wolverineav/neutron,skyddv/neutron,neoareslinux/neutron,suneeth51/neutron,wenhuizhang/neutron,adelina-t/neutron,MaximNevrov/neutron,bigswitch/neutron,asgard-lab/neutron,bigswitch/neutron,eonpatapon/neutron,jacknjzhou/neutron,yanheven/neutron,JianyuWang/neutron,SamYaple/neutron,openstack/neutron