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

openstack/networking-plumgrid,openstack/networking-plumgrid,fawadkhaliq/networking-plumgrid,msagheer/networking-plumgrid,stackforge/networking-plumgrid,stackforge/networking-plumgrid,msagheer/networking-plumgrid,fawadkhaliq/networking-plumgrid