RFR: Add --recurse-submodules to applicable actions in GitRepository

[Erik Helin]

Hi all,

please review this small patch that adds `--recurse-submodules` to applicable operations in `GitRepository`.

Thanks,
Erik

## Testing
- `make test` on Linux x64

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Commits:
 - 6d62da63: Add --recurse-submodules to applicable actions in GitRepository

Changes: https://git.openjdk.java.net/skara/pull/220/files
 Webrev: https://webrevs.openjdk.java.net/skara/220/webrev.00
  Stats: 5 lines in 1 file changed: 2 ins; 0 del; 3 mod
  Patch: https://git.openjdk.java.net/skara/pull/220.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/220/head:pull/220

PR: https://git.openjdk.java.net/skara/pull/220