Add Datasource bootsource property

[hmeir]

Short description

Adding boot source proprety to DataSource class.
Accessing it returns PVC / Volumesnapshot boot source - the one the the Datasource is pointing to.

More details:

Also added deprecation message on 'pvc' property, starting from 4.16.

What this PR does / why we need it:

Datasource has only pvc property - now it can access snapshot as well.

[redhat-qe-bot1]

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[sonarqubecloud]

Quality Gate passed

Kudos, no new issues were introduced!

0 New issues
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud

[hmeir]

/verified

[hmeir]

/cherry-pick v4.15

[redhat-qe-bot]

Manual cherry-pick is needed
Cherry pick failed for 16fa5d4 to v4.15:
To cherry-pick run:

git remote update
git checkout v4.15
git pull origin v4.15
git checkout -b datasource-snapshot-prop-v4.15
git cherry-pick 16fa5d4412fc69d62466fdf8dc81e5edf0013323
git push origin datasource-snapshot-prop-v4.15