fs_mgr: overlayfs: test: add inRecovery check

Handle a device in recovery mode gracefully.  Handle a device
that fails to boot into a commanded state more gracefully.

Deal with regression where die() calls restore(), and we can not
have this under the conditions where we are ignoring the error
in a subshell.

Test: adb-remount-test.sh
Bug: 118225373
Bug: 123079041
Change-Id: Ie37beb245d0ec55eb00757cdb93da34ff9c42827