[Bug 268088] [PATCH] Check MTU of $iface before creating epair in jib script

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=268088

            Bug ID: 268088
           Summary: [PATCH] Check MTU of $iface before creating epair in
                    jib script
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: misc
          Assignee: bugs@FreeBSD.org
          Reporter: niece.uptake165@hiu6mpxacf6d.mailer.me

Created attachment 238460
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=238460&action=edit
Patch file for jib script

When the jib script creates the bridge interface that bridge inherits the mtu
setting of $iface. However, when the jib script create the epair interface the
epair interface gets a default mtu of 1500. If the inherited mtu of the bridge
does not match the default mtu of 1500 from the epair interfaces the script
will fail.

This patch checks the mtu of $iface (that will be inherited by the bridge) and
applies that mtu to the two epair interfaces after creation to ensure the mtu
matches and the script succeeds. I didn't see a single ifconfig command that
gives the mtu value so I grep'd it out of the standard ifconfig output.

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