pkg/report: add KUBSan netbsd reports

Just to detect them at all and have some test base.
Will need better bug identification later.

pkg/report/netbsd.go

@@ -76,4 +76,14 @@ var netbsdOopses = []*oops{
 		},
 		[]*regexp.Regexp{},
 	},
+	{
+		[]byte("KUBSan:"),
+		[]oopsFormat{
+			{
+				title: compile("KUBSan:"),
+				fmt:   "KUBSan: Undefined behavior",
+			},
+		},
+		[]*regexp.Regexp{},
+	},
 }

pkg/report/testdata/netbsd/report/10

@@ -0,0 +1,3 @@
+TITLE: KUBSan: Undefined behavior
+
+[    3.379785] KUBSan: Undefined behavior in /usr/src/sys/dev/usb/xhci.c:413:2, member access within misaligned address 0xffffe4013a4b4008 for type 'const struct xhci_softc' which requires 16 byte alignment

pkg/report/testdata/netbsd/report/11

@@ -0,0 +1,3 @@
+TITLE: KUBSan: Undefined behavior
+
+[    3.389788] KUBSan: Undefined behavior in /usr/src/sys/dev/ic/ahcisata_core.c:558:16, left shift of 1 by 31 places cannot be represented in type 'int'

pkg/report/testdata/netbsd/report/8

@@ -0,0 +1,3 @@
+TITLE: KUBSan: Undefined behavior
+
+[    6.580814] KUBSan: Undefined behavior in /usr/src/sys/arch/amd64/amd64/kobj_machdep.c:118:10, store to misaligned address 0xffffffff855d1239 for type 'Elf64_Addr' which requires 8 byte alignment

pkg/report/testdata/netbsd/report/9

@@ -0,0 +1,3 @@
+TITLE: KUBSan: Undefined behavior
+
+[   92.248325] KUBSan: Undefined behavior in /usr/src/sys/netinet/tcp_input.c:1362:18, load of misaligned address 0xffffe40815d3c03e for type 'u_int32_t' which requires 4 byte alignment