Use a fixed abbreviation size in `git describe` output

Currently, this setting depends on whatever the user of `godep` has in their `git config --get core.abbrev`, if it is set. Even when it is not set, the number of characters used in the shortened git commit will depend on whether there are collisions for that prefix on the local repository (which in large part depends on how much activity exists there.) As a result, when multiple users are maintaining Godeps/ for a single project, many spurious changes to Godeps/Godeps.json are generated due to the lack of stability in the length of the abbreviated commit in output of `git describe`. Let's fix this by enforcing a reasonable abbreviation length in godep's use of `git describe`. 14 characters is very unlikely to result in collisions for prefixes.

Use a fixed abbreviation size in `git describe` output
db895465 · Filipe Brandenburger · Christoph Blecker · 57e1d0ad · db895465
Unverified Commit db895465 authored Oct 24, 2018 by Filipe Brandenburger Committed by Christoph Blecker Nov 06, 2018
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vcs.go third_party/forked/godep/vcs.go +1 -1

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--- a/third_party/forked/godep/vcs.go
+++ b/third_party/forked/godep/vcs.go
@@ -40,7 +40,7 @@ var vcsGit = &VCS{
 	vcs: vcs.ByCmd("git"),

 	IdentifyCmd: "rev-parse HEAD",
-	DescribeCmd: "describe --tags",
+	DescribeCmd: "describe --tags --abbrev=14",
 	DiffCmd:     "diff {rev}",
 	ListCmd:     "ls-files --full-name",
 	RootCmd:     "rev-parse --show-cdup",