tests: Temporarily skip two testcases

The changes [1] and [2] made to CURRENT introduce races between ifnet
detach and vmove operations. That requires extra effort to fix. They
are not MFCed to stable branches so the latter are not affected.
Temporarily skip two affected tests on CURRENT right now.

[1] 0bf42a0a05 bpf: virtualize bpf_iflist
[2] a4d766caf7 bpf: add a crutch to support if_vmove

PR:		292993
Discussed with:	kp

tests/sys/net/if_clone_test.sh

@@ -104,6 +104,8 @@ epair_destroy_race2_head()
 }
 epair_destroy_race2_body()
 {
+	atf_skip "Need BPF fix due to (bpf: virtualize bpf_iflist)"
+
 	jid=$(jail -ic vnet host.hostname="epair_destroy2" persist path=/)
 
 	for i in `seq 1 10`

tests/sys/netgraph/eiface_test.sh

@@ -35,6 +35,8 @@ pr292993_head()
 
 pr292993_body()
 {
+	atf_skip "Need BPF fix due to (bpf: virtualize bpf_iflist)"
+
 	vnet_init
 
 	for i in `seq 1 10`