tests: configure fsmonitor.mode=paranoid always if fsmonitor is used
This forces fsmonitor extension execute "paranoid" code path.
Strict speaking, we should make fsmonitor-run-tests.py accept own
specific options, but there is no code path, which is disabled in
"paranoid" mode, at least now. Therefore, this solution seems
reasonable enough.
$ hg init
$ echo This is file a1 > a
$ hg add a
$ hg commit -m "commit #0"
$ ls
a
$ echo This is file b1 > b
$ hg add b
$ hg commit -m "commit #1"
$ hg co 0
0 files updated, 0 files merged, 1 files removed, 0 files unresolved
B should disappear
$ ls
a