Add shell pre-commit check and fix issues found
Signed-off-by:Anton Bondarenko <anton.bondarenko@arm.com> Approved-by:
Jens Elofsson <jens.elofsson@arm.com>
Signed-off-by:Anton Bondarenko <anton.bondarenko@arm.com> Approved-by:
Jens Elofsson <jens.elofsson@arm.com>