Eugene Grosbein 35b930cc2b Make dhclient(8) verify if new MTU (option 26) differs from current one and skip unneeded MTU change.
This check eliminates infinite loop of MTU change / link flap / lease verification / MTU change / link flap etc.
in case of some NIC drivers like em(4) or igb(4).

N.B.: obsolete u_int16_t is used in consistency with the rest of the file.

PR:		229432
Approved by:	mav (mentor)
MFC after:	1 week
2018-07-11 09:41:50 +00:00
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