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

Merge pull request projectcalico#1027 from bcreane/release-v2.5.0

Update to confd-v0.12.1-calico-0.3.0 for v2.5.0-rc2

Move to libcalico v1.6.0.

Update versions for Calico v2.4.1

Add latest redirects to v2.4

Calico v2.4.0-rc2

Changes for Calico release v2.4.0-rc1