Add support for shallow mirror tarballs

The latest incarnation of the support for git shallow mirror tarballs. Updated with ud.mirrortarball removed, fixes for gitsm and gitannex, more granular commits to ease review, and unit tests added. Please let me know what you think. Thanks.

The following changes since commit 21d963149b5d97452420230a252101115b708d85:

toaster: move release lookup from morty to pyro (2017-04-20 07:59:30 +0100)

are available in the git repository at:

[email protected]:kergoth/bitbake.git shallow

for you to fetch changes up to b4ca8fa8422818f7d09fbb1988bc189d2a8e7b52:

fetch/git: add support for removing arbitrary revs for shallow (2017-05-13 01:22:30 +0500)

----------------------------------------------------------------
Christopher Larson (8):
fetch: support multiple mirror tarball filenames
git-make-shallow: add script to make a git repo shallow fetch/git: add support for shallow mirror tarballs fetch/git: support per-branch/per-url depths for shallow fetch/git: add support for keeping extra refs for shallow fetch/gitsm: add support for shallow mirror tarballs fetch/gitannex: add support for shallow mirror tarballs fetch/git: add support for removing arbitrary revs for shallow

 bin/git-make-shallow      | 165 +++++++++++++
 lib/bb/fetch2/__init__.py |  72 +++---
 lib/bb/fetch2/git.py      | 189 +++++++++++++--
 lib/bb/fetch2/gitannex.py |  23 +-
 lib/bb/fetch2/gitsm.py    |  17 +-
 lib/bb/fetch2/hg.py       |   5 +-
 lib/bb/fetch2/npm.py      |   7 +-
 lib/bb/tests/fetch.py     | 603 ++++++++++++++++++++++++++++++++++++++++++++++
 8 files changed, 1017 insertions(+), 64 deletions(-)
 create mode 100755 bin/git-make-shallow

2.11.1