Remove FiberManager move-constructor
Summary:
LoopController and Fibers keep references to FiberManager, so implementing move-constructor for it is non-trivial.
The only purpose of move constructor was to have a create() static method, replaced it with a constructor accepting a type tag.
Test Plan: unit test + tao build
Reviewed By: stepan@fb.com, pavlo@fb.com
Subscribers: folly-diffs@, yfeldblum, chalfant
FB internal diff:
D1971881
Signature: t1:
1971881:
1428374073:
945d913e69eaa6f957dace981c23835105d91935