Proto commits in mailgun/groupcache

These 6 commits are when the Protocol Buffers files have changed:

Commit:1e232d7
Author:Derrick Wippler

Group.Set() now populates the main cache, and optionally the hotcache

The documentation is generated from this commit.

Commit:48a0ce2
Author:Derrick J. Wippler
Committer:Derrick J. Wippler

Get() now returns immediately when context is done * `Get()` now returns immediately when context is done during a groupcache peer conversation. Previously `Get()` would call the `Getter` with a done context.

Commit:ce8fe99
Author:Derrick J. Wippler

Sinks can not accept an expire time

Commit:4eab30f
Author:Brad Fitzpatrick

testpb: add syntax declaration to proto file Required for Google's internal build system.

Commit:7e022f8
Author:Brad Fitzpatrick
Committer:Brad Fitzpatrick

groupcachepb: add syntax declaration to proto file Required for Google's internal build system. Change-Id: I7cc7b1ffab9f4405715eeb675df3bf3bea85f107

Commit:6dad98a
Author:Brad Fitzpatrick
Committer:Brad Fitzpatrick

initial commit.