bitbake fetch improvements backport to denzil

On denzil bitbake was still trying to go out to internet for git repos when BB_NO_NETWORK was set. This set of backports fix that issue and now BB_NO_NETWORK works as expected

The following changes since commit 73cdebf60df225ee10f2eb215935be3b61e1b831:

documentation/dev-manual/dev-manual-kernel-appendix.xml: Add note about conflict (2012-06-29 15:54:26 +0100)

are available in the git repository at:

git://git.yoctoproject.org/poky-contrib kraj/denzil-fetcher-update
http://git.yoctoproject.org/cgit.cgi/poky-contrib/log/?h=kraj/denzil-fetcher-update

Richard Purdie (9):
bitbake/fetch: Spell out which fetcher backends support and recommend
checksums
bitbake: fetch2/__init__: Make it clearer when uri_replace doesn't
return a match
bitbake: fetch2: Fix error handling in uri_replace()
bitbake: fetch2: Only cache data if fn is set, its pointless caching
it against a None value
bitbake: fetch2: Ensure when downloading we are consistently in the
same directory
bitbake: fetch2: Split try_mirrors into two parts
bitbake: fetch2: Explicitly check for mirror tarballs in mirror
handling code
bitbake: fetch2: Improve mirror looping to consider more cases
bitbake: fetch2: Handle errors orruring when building mirror urls

 bitbake/lib/bb/fetch2/__init__.py |  218 ++++++++++++++++++++++++-------------
 bitbake/lib/bb/fetch2/git.py      |    3 +
 bitbake/lib/bb/fetch2/ssh.py      |    3 +
 bitbake/lib/bb/fetch2/wget.py     |    3 +
 4 files changed, 149 insertions(+), 78 deletions(-)

1.7.9.5