Convert flashrom to git

 - Drop support for Subversion in the getrevision script and Makefile.
 - Add .gitignore and .gitattributes file (the latter to limit exports).
 - Restore modification dates of the exported files from the SCM.
 - Stop exporting SCM log dumps to CHANGELOG. This makes no sense.
 - Export SCM metadata needed by the Makefile to Makefile.VCS
 - Do not export the pre-"compiled" manpage. It can be generated like
   anything else from the code dump with Makefile.VCS
 - Add some initial client-side git hooks that get installed automatically
   on make runs:
   * pre-commit:
     - test for white space errors via git diff-index --check
   * commit-msg:
     - Use the up to date hook from gerrit to add Change-Id tags.
       Unlike the upstream hook, add them to fixup/squash changes too
       to match our staging behavior.
     - Test for duplicate sign-offs.
   * When pushing to the upstream repository check mandatory rules:
      - existing signoffs and acks in all new commits
      - no deletions of branches
      - no branches other than stable, staging and versioned branches
      - do not rewrite history of branches, even if forced

Original-Change-Id: I64eef21982cac0a0a7419bcd2c8a936672ae9cb2
Original-Reviewed-on: https://review.coreboot.org/19206
Original-Reviewed-by: Nico Huber <nico.h@gmx.de>
Original-Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Original-Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

Change-Id: I08a324ce1fd8afcc6f516ddfb6f09e05a67cdd17
Signed-off-by: Stefan Tauner <stefan.tauner@gmx.at>
Signed-off-by: David Hendricks <dhendricks@fb.com>
Signed-off-by: Nico Huber <nico.h@gmx.de>
---
A .gitattributes
A .gitignore
M Makefile
M flashrom.c
M util/getrevision.sh
A util/git-hooks/applypatch-msg
A util/git-hooks/commit-msg
A util/git-hooks/install.sh
A util/git-hooks/pre-applypatch
A util/git-hooks/pre-commit
A util/git-hooks/pre-push
A util/git-hooks/wrapper.sh
12 files changed, 437 insertions(+), 131 deletions(-)