Juniper request : skip installer download

[devidask27]

ISSUE(S):

https://platform9.atlassian.net/browse/INF-2864

SUMMARY

added one hidden flag to skip installer download step.

ISSUE TYPE

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that may cause existing functionality to not work as expected)
• This change requires a documentation update

IMPACTED FEATURES/COMPONENTS:

prep-node

TESTING DONE

Manual

Tested prep-node with and without --skip-installer-downloadflag
case one
prep-node --skip-installer-download, but installer is not present in pf9 dir
result --> failing with below logs

{"level":"debug","ts":"2023-08-03T12:00:49.9112Z","caller":"pmk/node.go:263","msg":"User skiped installer download"}
{"level":"debug","ts":"2023-08-03T12:00:49.9384Z","caller":"pmk/node.go:320","msg":"Ran command sudo \"bash\" \"-c\" \"chmod +x /root/pf9/installer.sh\""}
{"level":"debug","ts":"2023-08-03T12:00:49.9385Z","caller":"pmk/node.go:320","msg":"stdout:stderr:chmod: cannot access '/root/pf9/installer.sh': No such file or directory\n"}

case two
prep-node --skip-installer-download, installer is already copied in pf9 dir
result --> node onboarded successfully

case three
natural flow, prep-node without --skip-installer-download flag
result --> node onboarded successfully

Reviewers

/cc @sudhakarg @psarwate