pfctl: allow new page character (^L) in pf.conf

PF configuration files can contains many things.

Using the new page characters (i.e. ^L, \014) to mark the beginning
of parts is useful because many editors such as emacs and vim has
facilities to jump next/previous ones.

PR:		86635
MFC after:	2 weeks
Submitted by:	MOROHOSHI Akihiko <moro@remus.dti.ne.jp>
Submitted by:	Simon Wollwage <rootnode+freebsd@wollwage.com>
Sponsored by:	Rubicon Communications, LLC ("Netgate")

sbin/pfctl/parse.y

@@ -7399,7 +7399,7 @@ yylex(void)
 
 top:
 	p = buf;
-	while ((c = lgetc(0)) == ' ' || c == '\t')
+	while ((c = lgetc(0)) == ' ' || c == '\t' || c == '\014')
 		; /* nothing */
 
 	yylval.lineno = file->lineno;

sbin/pfctl/tests/files/pf1078.in

@@ -0,0 +1,3 @@
+pass in proto tcp
+
+pass in proto udp

sbin/pfctl/tests/files/pf1078.ok

@@ -0,0 +1,2 @@
+pass in proto tcp all flags S/SA keep state
+pass in proto udp all keep state

sbin/pfctl/tests/pfctl_test_list.inc

@@ -186,3 +186,4 @@ PFCTL_TEST_FAIL(1074, "Filter AF different than route-to AF, without prefer-ipv6
 PFCTL_TEST(1075, "One shot rule")
 PFCTL_TEST(1076, "State limiter")
 PFCTL_TEST(1077, "Source limiter")
+PFCTL_TEST(1078, "New page")