[6.12.z] Gracious message when vault is not reachable

[Satellite-QE]

Cherrypick of PR: #14942

Problem Statement

When the VPN is not connected today, an unclear/lengthy traceback:

# make vault-login                                  
2024-05-03 15:16:29 - robottelo - ERROR - Error! b'Error authenticating: Put "https://vault.example.com:8200/v1/auth/oidc/oidc/auth_url": dial tcp: lookup vault.example.com: no such host\n'
Traceback (most recent call last):
  File "/Users/jyejare/gitrepos/robottelo/scripts/vault_login.py", line 10, in <module>
    vclient.login()
  File "/Users/jyejare/gitrepos/robottelo/robottelo/utils/vault.py", line 94, in login
    token = json.loads(str(token.decode('UTF-8')))['data']['id']
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/homebrew/Cellar/[email protected]/3.12.3/Frameworks/Python.framework/Versions/3.12/lib/python3.12/json/__init__.py", line 346, in loads
    return _default_decoder.decode(s)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/homebrew/Cellar/[email protected]/3.12.3/Frameworks/Python.framework/Versions/3.12/lib/python3.12/json/decoder.py", line 337, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/homebrew/Cellar/[email protected]/3.12.3/Frameworks/Python.framework/Versions/3.12/lib/python3.12/json/decoder.py", line 355, in raw_decode
    raise JSONDecodeError("Expecting value", s, err.value) from None
json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)
make: *** [vault-login] Error 1

Solution

When the VPN is not connected with this PR, a nice message:

# make vault-login                                            
2024-05-03 15:11:07 - robottelo - INFO - The Vault host is not reachable, check network availability

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