Move setup_develop call

Move setup_develop() call into the install_XXX() function as the
distinction has no real purpose.  This eliminates the configure_XXXclient()
function for Nova and Swift.

Also create install_cinderclient() as we will need it to handle dependencies
in a followup patch.

Change-Id: I61d761bc57a31caf2ed0ade326ab236eb2bb7358
Merge branch 'nova-api-revert' into dt-test
Merge branch 'openrc-stackenv' into dt-test
Merge branch 'more-setup' into dt-test