fs_mgr: harden adb-remount-test.sh

Harden adb-remount-test.sh script.  Add --no-color and --color
options.  Allows --serial to be passed in.  Add a recovery handler
that restores the device to verity enabled if possible.  List the
partitions sizes as they may be relevant to triaging errors.  Allow
for devices that have a mixed set of remounts, some direct, some
with overlayfs.  Allow two scripts to run at the same time on a host
machine targetting different devices.  Detect if wrong adb is used
for adb reboot-fastboot.

Add a build target for adb-remount-test.sh so that the script
is landed into the host tools bin for easy pickup.

Test: adb-remount-test.sh
Bug: 123079041
Change-Id: I6369a245a656419067ec4350a4dbdf78c9b0533e