[coreboot-gerrit] Patch merged into coreboot/master: util/release: Add support for signed tags and releases

the following patch was just integrated into master:
commit 6e4204a0d196615ebb19d6f03f2eff2307bd6380
Author: Philipp Deppenwiese 
Date:   Thu Sep 8 22:35:48 2016 +0200

util/release: Add support for signed tags and releases

* Add gpg key command-line parameter for signing.
    * Add username command-line parameter for secure ssh clone.
    * Tag and releases are signed.
    * Generates ascii amored signature files.

Change-Id: I41347a85145dd0389e3b69939497fb8543db4996
    Signed-off-by: Philipp Deppenwiese 
    Reviewed-on: https://review.coreboot.org/16553
    Tested-by: build bot (Jenkins)
    Reviewed-by: Martin Roth

See https://review.coreboot.org/16553 for details.

-gerrit