Remove hard dependency on PDO#2958

Merged

Ocramius merged 13 commits intodoctrine:developfrom

morozov:issues/2953

Jan 25, 2018

Commits on Jan 8, 2018

Added visibility for interface methods as required by the coding standard
morozov
committed

Commits on Jan 13, 2018

Removed HydratorMockStatement since it's not used anywhere since 2.0
morozov
committed

Commits on Jan 25, 2018