Until now, only environment files were tested for their eXistenZ. This
patch corrects this issue, allowing to get a graceful failure before
plan is compiled and uploaded.
The following files are now checked, and deploy will gracefully fail in
case of non-existing file:
- plan-environment-file
- answers-file
- networks-file
No Bioport nor Pod was harmed for this patch.
Change-Id: Ifd4229b68571fd6b91574675c1f04d7b5c755eab
Closes-Bug: #1834307
(cherry picked from commit bd354f1fc8)
(cherry picked from commit f78809a3e3)
(cherry picked from commit cb976f6729)