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.
Chasing down another #$^%&&^^^$%%#$ prettytable version pin
Change-Id: I61d761bc57a31caf2ed0ade326ab236eb2bb7358