yum_versionlock: new module (#1405)

* new module: yum_versionlock

* Removed redundant logic
* Added check_mode support
* Updated examples
* Updated documentation

Co-authored-by: Abhijeet Kasurde <akasurde@redhat.com>
Co-authored-by: Andrew Klychkov <aaklychkov@mail.ru>
Co-authored-by: Erik-jan Riemers <riemers@binkey.nl>

* Update plugins/modules/packaging/os/yum_versionlock.py

Co-authored-by: Andrew Klychkov <aaklychkov@mail.ru>

* Fix version_added

* Add module symlink

* Fix symlink

* Improve documentation formatting by Anderssoon007

Co-authored-by: Andrew Klychkov <aaklychkov@mail.ru>

* Improve documentation formatting by Anderssoon007

Co-authored-by: Andrew Klychkov <aaklychkov@mail.ru>

* Improve documentation

* Add notes section

* check_mode is supported

* Initial integration test

* Change pkg to name

* Do the tests only when there is something to update

* Ignore CentOS 6

* Fix

* Do not update obsolete packages

* yum -q versionlock list does not show anything in CentOS 8

* Various suggestions by Andersson007

Co-authored-by: Andrew Klychkov <aaklychkov@mail.ru>

* Apply suggestions from felixfontein review

Co-authored-by: Felix Fontein <felix@fontein.de>

* returned always

* Apply felixfontein suggestion

Co-authored-by: Felix Fontein <felix@fontein.de>

* Fix RETUNRED values returned

* Change default from present to locked

* Remove locked, unlocked states

* change locked/unlocked to present/absent in integration tests

Co-authored-by: Felix Fontein <felix@fontein.de>

* Fix module short_description formatting

* Add myself as co-author

Co-authored-by: Erik-jan Riemers <riemers@binkey.nl>
Co-authored-by: Abhijeet Kasurde <akasurde@redhat.com>
Co-authored-by: Andrew Klychkov <aaklychkov@mail.ru>
Co-authored-by: Felix Fontein <felix@fontein.de>

plugins/modules/yum_versionlock.py

@@ -0,0 +1 @@
+./packaging/os/yum_versionlock.py