[Bug 256179] [msdosfs] boots into single-user mode when changing drives

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=256179

            Bug ID: 256179
           Summary: [msdosfs] boots into single-user mode when changing
                    drives
           Product: Base System
           Version: 13.0-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: conf
          Assignee: bugs@FreeBSD.org
          Reporter: freebsd@darkain.com

Starting in FreeBSD 13.0-RELEASE, when fresh installing on AMD64 EFI systems,
an entry is added to /etc/fstab for /dev/ada0p1 pointing to /boot/efi for
example.

If another drive is added to the system, or a drive is removed, or a controller
is changed which would alter the "ada0p1" reference, the msdosfs partition will
fail to mount, forcing the boot process into single user mode.

I attempted to add the "failok" option to this line in fstab, but that made no
difference.


Error text:
-------
/dev/ada0p1: UNEXPECTED INCONSISTENCY; RUN fsck_msdosfs MANUALLY
THE FOLLOWING FILE SYSTEM HAD AN UNEXPECTED INCONSISTENCY:
        msdosfs: /dev/ada0p1 (/boot/efi)
Automatic file system check failed: help!
ERROR: ABORTING BOOT (sending SIGTERM to parent)!
2021-05-27T03:28:56.765915+00:00 - init 1 - - /bin/sh on /etc/rc terminated
abnormally, going to single user mode
Enter full pathname of shell or RETURN for /bin/sh:


Quick reproduction:
-------
Create a new VM using VMware and install FreeBSD 13.0-RELEASE on it like
normal.
Power down the VM.
Change the storage type for the virtual disk (eg: from SAS to IDE)
Boot up the VM.
*!BOOM!*

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