FS-9509: [avmd] Add perl script subscribing to avmd events

The script will subscribe to avmd events and output them to the console.

src/mod/applications/mod_avmd/scripts/avmd_get_events.pl

+#brief  Subscribe to avmd events and print them to the console.
+#author Piotr Gregor <piotrgregor@rsyncme.org>
+#date   13 Sept 2016 09:44 PM
+
+
+#!/usr/bin/perl                                                                                
+use strict;
+use warnings;
+require ESL;
+
+my $host = "127.0.0.1";
+my $port = "8021";
+my $pass = "ClueCon";
+
+my $format = "plain";
+
+if ($#ARGV + 1 eq 1) {
+    $format = $ARGV[0];
+    print "Using format: [" .$format ."]\n";
+}
+
+my $con  = new ESL::ESLconnection($host, $port, $pass);
+if (!$con) {
+    die "Unable to establish connection to $host:$port\n";
+}
+if ($con->connected()) {
+    print "OK, Connected.\n";
+} else {
+    die "Conenction failure.\n";
+}
+
+print "Subscribing to avmd events...\n";
+$con->events("plain", "CUSTOM avmd::start");
+$con->events("plain", "CUSTOM avmd::stop");
+$con->events("plain", "CUSTOM avmd::beep");
+
+print "Waiting for the events...\n";
+while($con->connected()) {
+    my $e = $con->recvEvent();
+    my $avmd_event_type = "";
+    $avmd_event_type = $e->getHeader("Event-Subclass");
+    if ($avmd_event_type eq 'avmd::start') { # mark nicely the start of new session and event streak - most likely there will be other events from this session coming after this one
+        print "\n--------------------\n\n";
+    }
+    if ($e) {
+        my $body = $e->serialize($format);
+        print $body;
+        print "\n\n";
+    }
+}
+
+print "Disconnected.\n\n";