PC-BSD/trueos fcbc697tests/sys/net if_tun_test.sh Makefile

MFC r344797:

tun tests: Test renaming and destroying a tun interface in a vnet jail

There was a problem destroying renamed tun interfaces in vnet jails. This was
fixed in r344794. Test the previously failing scenario.

PR:             235704
DeltaFile
+30-0tests/sys/net/if_tun_test.sh
+1-0tests/sys/net/Makefile
+31-02 files

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