[docs] Update documentation for dynamic namespace configuration in Co…

…ordinator (m3db#2874)

[docs] Update documentation for dynamic namespace configuration in Co…

…ordinator (m3db#2874)

[dbnode] Add validation to ensure index claims is singleton (m3db#2877)

[dbnode] Remove namespaces from example config and integration tests (m…

…3db#2866)

Replace closer with resource package (m3db#2864)

[dbnode] Add ability to force enable cold writes from config (m3db#3002)

Build just services for hotfix branch

[dbnode] Bump default filesystem persist rate limit (m3db#2806)

[dbnode] Add index regexp DFA compilation cache to avoid allocating D…

…FAs for same expressions (m3db#2814)

[query] Add lookback duration from query config (m3db#2913)