Gcc puller generic

[chmnata]

What this pull request accomplishes:

• Update gcc_layer_puller.py to pull any layer on the gcc rest api without having to choose between partition table/audit table.

Issue(s) this solves:

• closes #1028

What, in particular, needs to reviewed:

• if the readme is detailed enough, if the reviewer can try to test pull this with requirement.txt packages it would be greaattt.
• also updated the gcc_puller_functions

What needs to be done by a sysadmin after this PR is merged

Have to test again on morbius before merging.