tests: ubifs_tools: fsck_tests: Add corrupt+fsck+fault_inject test

tests: ubifs_tools: fsck_tests: Add corrupt+fsck+fault_inject test

Inject memory/io fault while doing fsck for corrupted UBIFS images.
This testcase mainly checks whether fsck.ubifs has problems (eg.
UAF, null-ptr-def, etc.) in random error paths. Besides, it provides
a similar way to simulate powercut during fsck, and checks whether
the fsck.ubifs can fix an UBIFS image after many rounds interrupted
by kinds of errors.

Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>