The upgrade scripts have a *ton* of historical cruft in them. This is
a bulk clean up patch that does the following things:
- ensures we source grenaderc before functions, we need this for
devstack dir definitions.
- moves xtraces until after sources to trim down irrelevant output
- removes as many variables and library sources as possible to ensure
that we include the minimum possible code in these scripts (for
sanity and readability).
This skips the neutron upgrade script, much like in devstack, the
neutron code has so many extra variables it's not clear what's really
needed.
Change-Id: Idac9190fd33478a479f7c7dd5cb1be894bb03444
8ee1af8f3b