virt-who fails with no valid configuration found

Issue

• Virt-who is unable to read the configuration file and failing with "virt-who can't be started: no valid configuration found".

2021-09-07 10:20:54,675 [ERROR] @config.py:xxxx - [vmware]: Unable to read key file: [Errno 2] No such file or directory: '/var/lib/virt-who/key'
2021-09-07 10:20:54,676 [WARNING] @config.py:xxxx - [vmware]: "filter_hosts" is set, but filter_type is not set. Possible values of filter_type: "regex, wildcards". Using default: "wildcards".
2021-09-07 10:20:54,676 [WARNING] @config.py:xxxx - [vmware]: Ignoring unknown configuration option "env"
2021-09-07 10:20:54,676 [ERROR] @config.py:xxxx - [vmware]: Required option: "password" not set.
2021-09-07 10:20:54,676 [WARNING] @config.py:1556 - Dropping invalid configuration "vmware"
2021-09-07 10:20:54,676 [WARNING] @config.py:1556 - No valid configurations found
2021-09-07 10:20:54,676 [ERROR] @main.py:143 - virt-who can't be started: no valid configuration found

• Post encrypted password update in the virt-who configuration, virt-who service fails to start.