fix bug lp:1025526,update iniparser.py to accept  empty value.
fix bug lp:1025526,update iniparser.py to accept  empty value.

also,this patch turn off pep8 E125 check,this for now seems to
be unnecessary,it check continuous line split.and update the
latest openstack-common https://review.openstack.org/#/c/9201
which has fix pep8 1.3 issue except for E125 check.

Change-Id: I86e6a3add56a0a2941031a1248f1696667ac56b8

gotostack/neutron-lbaas,openstack/neutron-vpnaas,gaolichuang/neutron-fwaas,schoksey/networking-odl,citrix-openstack-build/neutron-lbaas,citrix-openstack-build/neutron-vpnaas,openstack/networking-odl,gotostack/neutron-lbaas,openstack/networking-odl,dougwig/x-neutron-fwaas,gaolichuang/neutron-fwaas,FedericoRessi/networking-odl,CiscoSystems/networking-odl,CiscoSystems/networking-odl,FedericoRessi/networking-odl,openstack/neutron-vpnaas,openstack/neutron-fwaas,dougwig/x-neutron-vpnaas,flavio-fernandes/networking-odl,openstack/networking-odl,schoksey/networking-odl,gandelman-a/neutron-lbaas,openstack/neutron-fwaas,gandelman-a/neutron-lbaas,flavio-fernandes/networking-odl,mestery/x-stackforge-odl,gandelman-a/neutron-lbaas,citrix-openstack-build/neutron-fwaas,dougwig/x-neutron-lbaas,gotostack/neutron-lbaas