Add multihost support for PostgreSQL collector#646

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wstranger wants to merge 4 commits intopython-diamond:masterfrom wstranger:master

+159-69

Commits on May 9, 2017

Add multihost support for postgres collector
Artyom Savichev
committed

Commits on May 10, 2017

pep8 fixes

Artem Savichev
authored and
wstranger
committed
Add default host for empty instances section
wstranger
committed

Commits on May 11, 2017

Fix BC with default host
wstranger
committed