common, tests: Print multiple skip reasons

common, tests: Print multiple skip reasons

Some test cases or test groups have rather large number of test
run requirements and then they may have multiple skip reasons. However,
blktests can report only single skip reason. To know all of the skip
reasons, we need to repeat skip reason resolution and blktests run.
This is a troublesome work.

In this patch, we add skip reasons to SKIP_REASONS array, then all of
the skip reasons will be printed by iterating SKIP_REASONS at one shot
run.

Most of the works are done by following script:

sed -i 's/SKIP_REASON/SKIP_REASONS/' $(git ls-files)
git grep -h 'SKIP_REASONS=' | awk -F'SKIP_REASONS=' '{print $2}' | sort | uniq |
while read -r r
do
	s="SKIP_REASONS=$r"
	f=$(git grep -l "$s")
	sed -i "s@$s@SKIP_REASONS+=($r)@" $f
done

Signed-off-by: Li Zhijian <lizhijian@fujitsu.com>
Signed-off-by: Shin'ichiro Kawasaki <shinichiro.kawasaki@wdc.com>