Add which requirement to fedora.spec

Dependncy on 'which' needs to be added to fedora.spec
Remove glob for %{_localstatedir}/lib/pcp/config/pmie

The glob was breaking the build on fedora-rawhide
Add explicit fetch/store qa testcase for papi.control.multiplex

Append another testcase to ensure we can still fetch metric values
when mutliplexing is disable as well as papi.control.status returns
the value stored multiplexing variable
Add spin-rawhide script to build/rpm/ dir

spin-rawhide is a script that allows the user to (given proper permissions)
automatically build a pcp package on fedora-rawhide.
Add check for $PCP_WEB_JS variable, only clone/tar if needed

Currently, there are two sources for pcp builds, the core PCP git
tree, and a seperate tree for the javascript functionality.  If,
in the future, these two are combined, lets handle that
gracefully/automatically, as the individual running this script on
monday morning may completely forget.