[BPF/UT] set RPF to strict as test provision for that.

Make tests execute the path again after we introduced the option to
disable RPF.

felix/bpf/ut/bpf_prog_test.go

@@ -760,7 +760,7 @@ func objLoad(fname, bpfFsDir, ipFamily string, topts testOpts, polProg, hasHostC
 					VxlanPort:    testVxlanPort,
 					PSNatStart:   uint16(topts.psnaStart),
 					PSNatLen:     uint16(topts.psnatEnd-topts.psnaStart) + 1,
-					Flags:        libbpf.GlobalsNoDSRCidrs,
+					Flags:        libbpf.GlobalsNoDSRCidrs | libbpf.GlobalsRPFOptionStrict,
 					LogFilterJmp: 0xffffffff,
 				}