Use .zeek file suffix in unit tests

testing/btest/scripts/base/frameworks/input/basic.zeek

@@ -0,0 +1,64 @@
+# @TEST-EXEC: btest-bg-run bro bro -b %INPUT
+# @TEST-EXEC: btest-bg-wait 10
+# @TEST-EXEC: btest-diff out
+
+redef exit_only_after_terminate = T;
+
+@TEST-START-FILE input.log
+#separator \x09
+#path	ssh
+#fields	b	bt	i	e	c	p	pp	sn	a	d	t	iv	s	sc	ss	se	vc	ve	ns
+#types	bool	int	enum	count	port	port	subnet	addr	double	time	interval	string	table	table	table	vector	vector	string
+T	1	-42	SSH::LOG	21	123	5/icmp	10.0.0.0/24	1.2.3.4	3.14	1315801931.273616	100.000000	hurz	2,4,1,3	CC,AA,BB	EMPTY	10,20,30	EMPTY	4242
+@TEST-END-FILE
+
+@load base/protocols/ssh
+
+global outfile: file;
+
+redef InputAscii::empty_field = "EMPTY";
+
+module A;
+
+type Idx: record {
+	i: int;
+};
+
+type Val: record {
+	b: bool;
+	bt: bool;
+	e: Log::ID;
+	c: count;
+	p: port;
+	pp: port;
+	sn: subnet;
+	a: addr;
+	d: double;
+	t: time;
+	iv: interval;
+	s: string;
+	ns: string;
+	sc: set[count];
+	ss: set[string];
+	se: set[string];
+	vc: vector of int;
+	ve: vector of int;
+};
+
+global servers: table[int] of Val = table();
+
+event bro_init()
+	{
+	outfile = open("../out");
+	# first read in the old stuff into the table...
+	Input::add_table([$source="../input.log", $name="ssh", $idx=Idx, $val=Val, $destination=servers]);
+	}
+
+event Input::end_of_data(name: string, source:string)
+	{
+	print outfile, servers;
+	print outfile, to_count(servers[-42]$ns); # try to actually use a string. If null-termination is wrong this will fail.
+	Input::remove("ssh");
+	close(outfile);
+	terminate();
+	}