engine: resources: The http server flag res should autogroup

If we want to receive more than on flag (key) value, then these
obviously need to autogroup together, because it's the same http server
request that comes in and which should be shared by everyone with the
same path.

examples/lang/http-server-flag1.mcl

@@ -0,0 +1,66 @@
+# example of dual flag resource autogrouping+send/recv into http:server
+
+# mkdir -p '/tmp/testing/.ssh/' -m 700 && ssh-keygen -N '' -t 'ed25519' -f '/tmp/testing/.ssh/id_ed25519'
+
+# run mgmt...
+
+# /usr/bin/curl --data-urlencode 'done=true' --data-urlencode 'password=sha1TODO' --data-urlencode 'sshtype=ssh-ed25519' --data-urlencode "val2=$(cut -d ' ' -f 2 '/tmp/testing/.ssh/id_ed25519.pub')" --data-urlencode 'sshcomment=root@foo' -o - 'http://localhost:9090/action/done/mac=some_mac'
+
+import "fmt"
+import "value"
+
+$name1 = "foo"
+$name2 = "bar"
+$some_key = "some_mac"
+
+$key1 = "done"
+$key2 = "sshkey"
+
+http:server ":9090" {
+}
+
+http:server:file "/file1" {
+	data => "hello, world, i'm file1 and i don't exist on disk!\n",
+}
+
+http:server:flag "${name1}" {
+	key => "${key1}",
+	path => "/action/done/mac=${some_key}",
+	#mapped => {$str_true => $str_true, $str_false => $str_false,},
+}
+kv "${name1}" {
+	key => $name1,
+}
+value "${name1}" {
+	#any => true,	# bool
+}
+Http:Server:Flag["${name1}"].value -> Kv["${name1}"].value
+Http:Server:Flag["${name1}"].value -> Value["${name1}"].any
+
+
+#$st_val1 = value.get_bool($name1)
+$st_val1 = value.get_str($name1)
+$val1 = $st_val1->ready and $st_val1->value == "true" # export this value to parent scope
+
+http:server:flag "${name2}" {
+	key => "${key2}", # different key!
+	path => "/action/done/mac=${some_key}", # same path
+}
+kv "${name2}" {
+	key => $name2,
+}
+value "${name2}" {
+	#any => true,	# bool
+}
+Http:Server:Flag["${name2}"].value -> Kv["${name2}"].value
+Http:Server:Flag["${name2}"].value -> Value["${name2}"].any
+
+#$st_val2 = value.get_bool($name2)
+$st_val2 = value.get_str($name2)
+$val2 = $st_val2->value # possibly empty at the start
+
+
+file "/tmp/testing/info" {
+	state => "exists",
+	content => fmt.printf("val1: %t\nval2: %s\n", $val1, $val2),
+}