Add an option in lib/swift to increase max_header_size
Add an option in lib/swift to increase max_header_size

With the increasing number of entries in the service_catalog header,
some projects will have a header bigger than 8192 and Swift cannot
handle headers of this size. Solum is the first one to have this issue

As a temporary hack to fix Solum's gate, we are increasing
the value of the max_header_size parameter in our "lib" script.

This patch makes this settings global to all projects using devstack,
so that in a near future, if a project has a service_catalog header
bigger than 8192, it doesn't have the same problems we had.

Closes bug 1316585

Change-Id: I5c15f8f9531839353c3d99e46d920688058ec33c

BSJAIN92/OpenStack,samgoon/devstack,prithivm/branch01,avvocatodemarchis/devstack,pacinete/devstack,pacinete/devstack,openstack-dev/devstack,bq-xiao/devstack,NaokiMiyata/devstack,group-policy/devstack,pombredanne/devstack,bigswitch/devstack,varunarya10/devstack,costingalan/devstack,group-policy/devstack,atulpatil301/devstack,CloudServer/devstack,herrsechs/devstack,richliu/devstack,virtualopensystems/devstack,eharney/devstack,vsham20/devstack,eharney/devstack,nuxeh/devstack,varunarya10/devstack,TwinkleChawla/devstack,openstack-dev/devstack,innodee/openstackk,HPCHub/devstack,promptworks/devstack,mssumanth/devstack,liuquansheng47/devstack,samgoon/devstack,thomasem/devstack,bswartz/devstack,ozamiatin/devstack,bljgaurav/openstack-test,neerja28/Devstack_GlusterFS,atulpatil301/devstack,rushiagr/devstack,dirkmueller/devstack,avvocatodemarchis/devstack,LoHChina/devstack,promptworks/devstack,parul24/devstack,andrewrothstein/devstack,mmasaki/devstack,neerja28/Devstack_GlusterFS,olivierlemasle/devstack,vsham20/devstack,nawawi/openstack,herrsechs/devstack,pczerkas/devstack,CloudServer/devstack,HPCHub/devstack,mssumanth/devstack,vishnugonela/devstack,dirkmueller/devstack,costingalan/devstack,wenhuizhang/devstack,mc2014/devstack,dtroyer/devstack,olivierlemasle/devstack,mc2014/devstack,ozamiatin/devstack,nuxeh/devstack,richliu/devstack,TwinkleChawla/devstack,bswartz/devstack,noironetworks/devstack,liuquansheng47/devstack,bljgaurav/openstack-test,upadhyay-prashant/devstack,BSJAIN92/OpenStack,srics/devstack,tianweizhang/devstack,mmasaki/devstack,wenhuizhang/devstack,prithivm/branch01,sc68cal/devstack,sequenceiq/devstack,flavio-fernandes/devstack,kplus/devstack-moonshot,noironetworks/devstack,andrewrothstein/devstack,dtroyer/devstack,j4/devstack,thomasem/devstack,sc68cal/devstack,j4/devstack,Mahito/devstack,LoHChina/devstack,eshnil2000/devstack,upadhyay-prashant/devstack,sequenceiq/devstack,kplus/devstack-moonshot,affo/devstack,nawawi/openstack,bq-xiao/devstack,flavio-fernandes/devstack,parul24/devstack,pczerkas/devstack,tianweizhang/devstack,Mahito/devstack,affo/devstack,bigswitch/devstack,vishnugonela/devstack,NaokiMiyata/devstack,rushiagr/devstack,pombredanne/devstack