v3.0.0 beta release notes

Update libcalico to v2.0.0-alpha1

Merge pull request projectcalico#1197 from bcreane/v3.0-beta

Release notes for v3.0.0-alpha

Merge pull request projectcalico#1185 from neiljerram/release-v2.6.2

Calico v2.6.2

Release v2.6.1

Merge pull request projectcalico#1146 from bcreane/release-2.6.0

Release 2.6.0

Merge pull request projectcalico#1126 from bcreane/release-v2.6.0

v2.6.0-rc1 release changes.

Merge pull request projectcalico#1126 from bcreane/release-v2.6.0

v2.6.0-rc1 release changes.

Update version pins for Calico 2.5.1.

Rev Felix and Typha to pick up Typha client fix.

Merge pull request projectcalico#1047 from bcreane/release-v2.5.0

Release v2.5.0