add "info" as an alias to "capabilities"
add "info" as an alias to "capabilities"

Change-Id: Ia07554250a6aae8f3a6be6a70f83690ec3fc108c

sohonetlabs/python-swiftclient,varunarya10/python-swiftclient,iostackproject/IO-Bandwidth-Differentiation-Client,VyacheslavHashov/python-swiftclient,jeseem/python-swiftclient,VyacheslavHashov/python-swiftclient,zackmdavis/python-swiftclient,jeseem/python-swiftclient,zackmdavis/python-swiftclient,JioCloud/python-swiftclient,openstack/python-swiftclient,ironsmile/python-swiftclient,pratikmallya/python-swiftclient,krnflake/python-hubicclient,pratikmallya/python-swiftclient,varunarya10/python-swiftclient,JioCloud/python-swiftclient,iostackproject/IO-Bandwidth-Differentiation-Client,ironsmile/python-swiftclient,sohonetlabs/python-swiftclient,openstack/python-swiftclient