some scripts try sourcing ~/novarc

~~The scripts should be using the novarc script in the subdirectory for the project being used - I guess practically this means sourcing `./novarc`.~~

The scripts appear to be making the assumption that the undercloud novarc file is located at `~/novarc`. Ideally we shouldn't assume this - it would be great if it were documented that it looks for the undercloud novarc at `~/novarc`, and if it were a configurable location (perhaps via an environment variable override).

instances of sourcing this file: https://github.com/search?q=repo%3Acanonical%2Fstsstack-bundles%20%22~%2Fnovarc%22&type=code

Start with the repository code search linked in the issue and inspect each script that sources `~/novarc`. Trace how the undercloud novarc path is currently selected, then document the default location and make the location configurable as requested. Done means the scripts no longer require a fixed home-directory path and the expected configuration is documented.

Written by the indexing model from the issue text.