Update RabbitMQ log delimiter

This patch modifies the regex used by the rabbitmq splitter. It adds a
newline constant at the beginning of the regex to avoid to match the
first pattern of the log file. We observed that sometimes, the log
stream starts with a new line, so Heka finds a delimiter match on the
first two lines. But it does not have content for this log entry so it
may stop there.

Known issue: you miss the first log entry.

Change-Id: Ib2208db842de9f30a95a514f0e51d00d693374e1
Closes-Bug: #1550222

deployment_scripts/puppet/modules/lma_collector/manifests/logs/rabbitmq.pp

@@ -24,7 +24,7 @@ class lma_collector::logs::rabbitmq {
 
   heka::splitter::regex { 'rabbitmq':
     config_dir    => $lma_collector::params::config_dir,
-    delimiter     => '\n(=[^=]+====)',
+    delimiter     => '\n\n(=[^=]+====)',
     delimiter_eol => false,
     notify        => Class['lma_collector::service'],
   }