Jason Tedor 7f5349db57 Avoid cloning Mac instances
This commit modifies the HmacSHA1Provider to return a thread local
instance of Mac instead of using clone since some providers do not
support clone.

Closes elastic/elasticsearch#1468

Original commit: elastic/x-pack-elasticsearch@cb38f5f9e8
2016-02-06 09:12:39 -05:00
..
2016-02-06 09:12:39 -05:00