Add IpamInfo() function to retrun ipamV4Info and ipamV6Info
Add IpamInfo() function to retrun ipamV4Info and ipamV6Info

Related to docker/docker#18626

Signed-off-by: wenchma <484c768444514799b39aebd3c7a0b244f5784570@cn.ibm.com>

allencloud/libnetwork,runcom/libnetwork,jimmycmh/libnetwork,vdemeester/libnetwork,YujiOshima/libnetwork,mahak/libnetwork,hackersdotmu/libnetwork,mavenugo/libnetwork,aboch/libnetwork_new,abhi/libnetwork,medallia/libnetwork,kolyshkin/libnetwork,docker/libnetwork,kolyshkin/libnetwork,docker/libnetwork,msabansal/libnetwork,coolljt0725/libnetwork,medallia/libnetwork,jmzwcn/libnetwork,WeiZhang555/libnetwork,fcrisciani/libnetwork,tmakita/libnetwork,pyakpyak/libnetwork,fcrisciani/libnetwork,mahak/libnetwork,sainath14/libnetwork,mahak/libnetwork,abhi/libnetwork,kolyshkin/libnetwork,msabansal/libnetwork,mbanikazemi/libnetwork,jmzwcn/libnetwork,coolljt0725/libnetwork,pyakpyak/libnetwork,curtiszimmerman/libnetwork,abhi/libnetwork,sainath14/libnetwork,aboch/libnetwork_new,anortef/libnetwork,tgraf/libnetwork,vdemeester/libnetwork,curtiszimmerman/libnetwork,anortef/libnetwork,amitkris/libnetwork,cpuguy83/libnetwork,mYmNeo/libnetwork,hackersdotmu/libnetwork,jimmycmh/libnetwork,amitkris/libnetwork,mYmNeo/libnetwork,tgraf/libnetwork,docker/libnetwork,runcom/libnetwork,YujiOshima/libnetwork,WeiZhang555/libnetwork,allencloud/libnetwork,vdemeester/libnetwork,ityangchen/libnetwork,medallia/libnetwork,mavenugo/libnetwork,cpuguy83/libnetwork,ityangchen/libnetwork,tmakita/libnetwork,mbanikazemi/libnetwork