[Bug 238301] [PATCH] handle encrypted swap in dumpon rc.d script

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=238301

            Bug ID: 238301
           Summary: [PATCH] handle encrypted swap in dumpon rc.d script
           Product: Base System
           Version: 12.0-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: bin
          Assignee: bugs at FreeBSD.org
          Reporter: rozhuk.im at gmail.com

Created attachment 204791
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=204791&action=edit
Handle encrypted swap.

Then dumpdev="AUTO" then rc.d/dumpon looks for first avail swap file in
etc/fstab and if it exist - try to make them as dumpdev.

Typical encrypted swap:
/dev/SOME_DEV.eli none  swap   
sw,late,ealgo=AES-XTS,keylen=256,sectorsize=4096 0      0

Then rc.d/dumpon check this - /dev/SOME_DEV.eli does not exist.
Even if it exist it can not be used as dumpdev die to encrypt key will be
destroyed on reboot.

Patch simple strip ".eli" from end of devname before check existence.


PS:
1. Probably savecore should have some flag to able to write zeros/random on
dumpdev after read dump.
2. Feature req: run "trim" for swap before "swapon".

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