Clean up Nova API prereq

Bug 980966

Change-Id: If5bbcc094b54a2de96151d69653e57e0e540d6de
change the install/configure split

make setup_develop part of install so that configure is only about
config file setup.

Change-Id: I1ed58011e41c550d3ab2ba33b38cfe16adb3dde4
change configure/install split

make it so setup_develop happens in install instead of configure
to ensure that we can handle config file generation by itself.

Change-Id: I4801d7a0bc6642de2db5b78df1750666895f0aa3
Merge "Clean up Nova API prereq"