Correct the README.md descriptions

Drops the 'from git' from many of the elements. This implies
that the elements always use git... which they don't if
you are using packages.

Also, expands many of the descriptions to say 'and configures' since
most of these elements also contain the OAC/ORC scripts to actually
configure things as well.

Change-Id: I3cbf80c99cfedd73770c9d24e140b7d2443f0dda
Merge "Correct the README.md descriptions"