Failing tests due to string quoting changes in systemd unit files

[achilleas-k]

In osbuild/images#567 we made a non-functional change to the way we write systemd unit files. The Environment option in the osbuild stage now supports multiple entries. At the same time, we made it so that key=value assignments are quoted, which makes it easier to work with values with spaces.
From the systemd-exec man page:

ENVIRONMENT
       Environment=
           Sets environment variables for executed processes. Each line is unquoted using the rules described in "Quoting" section in
           systemd.syntax(7) and becomes a list of variable assignments. If you need to assign a value containing spaces or the equals sign to a
           variable, put quotes around the whole assignment.
...

           Example:

               Environment="VAR1=word1 word2" VAR2=word3 "VAR3=$word 5 6"

I think this change made CIV start failing to validate because it expects the unquoted strings in some of the cloud systemd units like here:

cloud-image-val/test_suite/generic/test_generic.py

Line 716 in 32b5842

'expect_config': 'Environment=NM_CLOUD_SETUP_AZURE=yes'

The line now is Environment="NM_CLOUD_SETUP_AZURE=yes" instead of Environment=NM_CLOUD_SETUP_AZURE=yes.