Add keyfile extensions tests
Add test, that NM creates keyfile without extension on RHEL, an with extension '.nmconnection' since version 1.14
Must be split to 3 tests: RHEL7, RHEL8, non RHEL
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Add test, that NM creates keyfile without extension on RHEL, an with extension '.nmconnection' since version 1.14
Must be split to 3 tests: RHEL7, RHEL8, non RHEL