[Test] Add multimap test

test/functional/cases/102_maps.robot

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+*** Settings ***
+Suite Setup     Generic Setup
+Suite Teardown  Generic Teardown
+Library         ${TESTDIR}/lib/rspamd.py
+Resource        ${TESTDIR}/lib/rspamd.robot
+Variables       ${TESTDIR}/lib/vars.py
+
+*** Variables ***
+${CONFIG}       ${TESTDIR}/configs/maps.conf
+${MESSAGE}      ${TESTDIR}/messages/spam_message.eml
+${RSPAMD_SCOPE}  Suite
+
+*** Test Cases ***
+MAP - DNSBL HIT
+  ${result} =  Scan Message With Rspamc  ${MESSAGE}  -i  127.0.0.2
+  Check Rspamc  ${result}  DNSBL_MAP
+
+MAP - DNSBL MISS
+  ${result} =  Scan Message With Rspamc  ${MESSAGE}  -i  127.0.0.1
+  Check Rspamc  ${result}  DNSBL_MAP  inverse=1  rc_nocheck=1

test/functional/configs/maps.conf

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+options = {
+	filters = ["spf", "dkim", "regexp"]
+	url_tld = "${TESTDIR}/../lua/unit/test_tld.dat"
+	pidfile = "${TMPDIR}/rspamd.pid"
+}
+logging = {
+	type = "file",
+	level = "debug"
+	filename = "${TMPDIR}/rspamd.log"
+}
+metric = {
+	name = "default",
+	actions = {
+		reject = 100500,
+	}
+	unknown_weight = 1
+}
+
+worker {
+	type = normal
+	bind_socket = ${LOCAL_ADDR}:${PORT_NORMAL}
+	count = 1
+	keypair {
+		pubkey = "${KEY_PUB1}";
+		privkey = "${KEY_PVT1}";
+	}
+}
+modules {
+    path = "${TESTDIR}/../../src/plugins/lua/"
+}
+multimap {
+  DNSBL_MAP {
+    type = "dnsbl";
+    map = "rspamd.com";
+  }
+}