[M] Change in flashrom[master]: util/lint: Introduce linter for git sign-off-by line

[Felix Singer (Code Review)]

Attention is currently required from: Edward O'Callaghan.

Hello build bot (Jenkins), Edward O'Callaghan,

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/flashrom/+/70079

to look at the new patch set (#7).

Change subject: util/lint: Introduce linter for git sign-off-by line
......................................................................

util/lint: Introduce linter for git sign-off-by line

For compliance and to check if the commit message matches the
development guidelines, add a linter checking for the sign-off-by line
from the commit message. Also, hook it up to the test_build.sh script
which is used for CI builds.

These scripts were copied from the coreboot repository and were adjusted
so that they work for flashrom.

Change-Id: I03f1827803f8492d60a0a44174d5822c2265bfcb
Signed-off-by: Felix Singer 
---
M test_build.sh
A util/lint/helper_functions.sh
A util/lint/lint-extended-020-signed-off-by
3 files changed, 93 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/flashrom refs/changes/79/70079/7