Merge pull request kubernetes-client#1655 from yliaog/update-21-base-2

Update submodule to the same version as master branch

Merge pull request kubernetes-client#1644 from yliaog/automated-relea…

…se-of-21.7.0b1-upstream-release-21.0-1638829098

Automated release of 21.7.0b1 upstream release 21.0 1638829098

Merge pull request kubernetes-client#1639 from yliaog/automated-relea…

…se-of-21.7.0a1-upstream-release-21.0-1638232914

Automated release of 21.7.0a1 upstream release 21.0 1638232914

Merge pull request kubernetes-client#1628 from yliaog/automated-relea…

…se-of-20.13.0-upstream-release-20.0-1637343269

Automated release of 20.13.0 upstream release 20.0 1637343269

Merge pull request kubernetes-client#1619 from yliaog/automated-relea…

…se-of-20.12.0b1-upstream-release-20.0-1636397891

Automated release of 20.12.0b1 upstream release 20.0 1636397891

Merge pull request kubernetes-client#1609 from yliaog/automated-relea…

…se-of-20.11.0a1-upstream-release-20.0-1635352326

Automated release of 20.11.0a1 upstream release 20.0 1635352326

Merge pull request kubernetes-client#1584 from roycaihw/automated-rel…

…ease-of-19.15.0-upstream-release-19.0-1635134453

Generate v19.15.0 client

Merge pull request kubernetes-client#1569 from roycaihw/v19b1

Generate v19.15.0b1 client

Merge pull request kubernetes-client#1552 from roycaihw/v19a1

Generate v19.15.0a1 client

Merge pull request kubernetes-client#1527 from roycaihw/v18-ga

Release 18.20.0