TESTS: move tests/*.cfg to tests/config

These are a collection of test files for a variety of features (old or
more recent). 2 or 3 files were found lying there non-committed and
were moved at the same time. A few deprecated or obsolete keywords were
updated to their recent equivalent. Many of these configurations are
made to trigger different parsing errors so it is normal that plenty
of them fail.

Now the tests directory is cleaner and easier to navigate through.
diff --git a/tests/conf/test-acl-args.cfg b/tests/conf/test-acl-args.cfg
new file mode 100644
index 0000000..26b909f
--- /dev/null
+++ b/tests/conf/test-acl-args.cfg
@@ -0,0 +1,36 @@
+# This config file aims to trigger all error detection cases in the ACL
+# expression parser related to the fetch arguments.
+
+# silence some warnings
+defaults
+	mode http
+	timeout client 1s
+	timeout server 1s
+	timeout connect 1s
+
+frontend 1
+	bind :10000
+
+	# missing fetch method in ACL expression '(arg)'.
+	http-request deny if { (arg) }
+
+	# unknown fetch method 'blah' in ACL expression 'blah(arg)'.
+	http-request deny if { blah(arg) }
+
+	# missing closing ')' after arguments to fetch keyword 'req.hdr' in ACL expression 'req.hdr('.
+	http-request deny if { req.hdr( }
+
+	# cannot be triggered : "returns type of fetch method '%s' is unknown"
+
+	# fetch method 'always_true' : no argument supported, but got 'arg' in ACL expression 'always_true(arg)'.
+	http-request deny if { always_true(arg) }
+
+	# fetch method 'req.hdr' : failed to parse 'a' as type 'signed integer' at position 2 in ACL expression 'req.hdr(a,a)'.
+	http-request deny if { req.hdr(a,a) }
+
+	# in argument to 'payload_lv', payload length must be > 0.
+	http-request deny if { payload_lv(0,0) }
+
+	# ACL keyword 'payload_lv' : expected type 'unsigned integer' at position 1, but got nothing.
+	http-request deny if { payload_lv }
+