Revert "Bump activemq-client from 5.17.4 to 5.18.0 (rh-messaging#569)" (rh-messaging#578)

This reverts commit 703122a.

(cherry picked from commit c488674)

Author: jiridanek

cli-activemq/pom.xml

@@ -35,7 +35,7 @@
     <properties>
         <bundle.symbolic.name.suffix>aoc</bundle.symbolic.name.suffix>
         <jar.main.class>com.redhat.mqe.aoc.Main</jar.main.class>
-        <activemq.client.version>5.18.0</activemq.client.version>
+        <activemq.client.version>5.17.4</activemq.client.version>
         <library.version>${activemq.client.version}</library.version>
     </properties>