scripts: add wrapper script for checkpatch

Add auxilary wrapper for convenient check of commit/
changes in staging area/multiple commits with checkpatch.pl
Put common functions for .travis.yml and c

scripts: add wrapper script for checkpatch

Add auxilary wrapper for convenient check of commit/
changes in staging area/multiple commits with checkpatch.pl
Put common functions for .travis.yml and checkpatch.sh into a
separate file

Signed-off-by: Igor Opaniuk <igor.opaniuk@linaro.org>
Reviewed-by: Jerome Forissier <jerome.forissier@linaro.org>

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