Bazel: Declare lib:jgit rule to adapt to latest gerrit master

Gerrit core switched to consume JGit from git module, and @jgit
repository is not available any more. To adapt the build tool chain for
both in tree and standalone build mode, replace @jgit repository with
//lib:jgit that works in both modes.

Change-Id: I116916f24b5c33222cf8dd017d0fa072639a5661
2 files changed