New feature: Switch storage system from cli

Add new command line option `--input.storage` to switch
used storage system (from `git` to `fs` or vice versa).

Signed-off-by: 35V LG84 <35vlg84-x4e6b92@e257.fi>
2 jobs for master in 7 minutes and 21 seconds (queued for 9 seconds)
Status Job ID Name Coverage
  Test
passed #183166923
test·jdk11

00:04:59

passed #183166924
test·jdk8

00:05:44

99.77%