[L] Change in coreboot[master]: util/lint: Update tools that use git to use a library

[Martin L Roth (Code Review)]

Attention is currently required from: Paul Menzel, Angel Pons, Felix Held.

Hello Felix Singer, build bot (Jenkins), Paul Menzel, Angel Pons, Elyes Haouas, Felix Held,

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

https://review.coreboot.org/c/coreboot/+/64973

to look at the new patch set (#5).

Change subject: util/lint: Update tools that use git to use a library
......................................................................

util/lint: Update tools that use git to use a library

Each of the tools that used git had similar functionality. This combines
all of that into a single script that gets sourced by each.  This makes
maintenance much easier.

By doing this and updating each of the scripts to do the correct thing
if the script isn't being run in a git repository, it makes them work
much better for the releases, which are just released as a tarball,
without any attached git repository.

Change-Id: I61ba1cc4f7205e0d4baf993588bbc774120405cb
Signed-off-by: Martin Roth 
---
A util/lint/helper_functions.sh
M util/lint/lint-000-license-headers
M util/lint/lint-007-checkpatch
M util/lint/lint-008-kconfig
M util/lint/lint-014-qualified-types
M util/lint/lint-extended-015-final-newlines
M util/lint/lint-extended-020-signed-off-by
M util/lint/lint-stable-003-whitespace
M util/lint/lint-stable-004-style-labels
M util/lint/lint-stable-005-board-status
M util/lint/lint-stable-008-kconfig
M util/lint/lint-stable-009-old-licenses
M util/lint/lint-stable-010-asm-syntax
M util/lint/lint-stable-012-executable-bit
M util/lint/lint-stable-013-site-local
M util/lint/lint-stable-016-non-ascii
M util/lint/lint-stable-017-configs
M util/lint/lint-stable-018-symlinks
M util/lint/lint-stable-019-header-files
M util/lint/lint-stable-021-coreboot-lowercase
M util/lint/lint-stable-022-clang-format
M util/lint/lint-stable-023-filenames
M util/lint/lint-stable-026-line-endings
23 files changed, 293 insertions(+), 152 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/73/64973/5