v2488: Merge pull request #3002 from zendesk/gurney/checks

[BRE-1009] Support GitHub's new Checks API for reference status on deploy review

v2487: Merge pull request #3006 from zendesk/grosser/blue-green

PAAS-2251 creating 2 budgets that match a single pod causes alerts du…

v2486: Merge pull request #3004 from zendesk/jylee/apiversionerror

show nicer error message for bad apiVersion to client

v2485: Merge pull request #3000 from zendesk/grosser/docs

document how to use system namespace

v2484: Merge pull request #2999 from zendesk/jylee/clusterrolenonamespace

adding clusterrole to namespacelesskind for metrics-server to work

v2483: Merge pull request #2998 from zendesk/grosser/logic

reuse KUBE_WAIT_FOR_LIVE in KUBE_WAIT_FOR_PREREQ

v2482: Merge pull request #2996 from rata/k8s-prereq-timeout

K8s prereq timeout

v2481: Merge pull request #2997 from zendesk/grosser/periodical

allow spaces in periodical to make it less surprising

v2480: Merge pull request #2989 from zendesk/jylee/namespaceless

allow namespaceless resources to not have a namspace, do not let apis…

v2479: Merge pull request #2994 from zendesk/gurney/default

Support setting a default user role for new users