Ensure log messages have valid json

- Fix messages getting contatenated at 8k
 - Fix rsyslog cutting off the opening brace of log messages
 - Make valid default conf and emit logs based on prescence of .sock and
 settings

installer/roles/image_build/files/rsyslog.conf

@@ -1 +1,6 @@
 $WorkDirectory /var/lib/awx/rsyslog
+$MaxMessageSize 700000
+$IncludeConfig /var/lib/awx/rsyslog/conf.d/*.conf
+$ModLoad imuxsock
+input(type="imuxsock" Socket="/var/run/rsyslog/rsyslog.sock" unlink="on")
+template(name="awx" type="string" string="%msg%")

installer/roles/image_build/templates/Dockerfile.j2

@@ -101,7 +101,7 @@ ADD rsyslog.repo /etc/yum.repos.d/
 RUN yum install -y rsyslog-omhttp
 
 # Pre-create things that we need to write to
-RUN for dir in /home/awx /var/run/supervisor /var/lib/awx /var/lib/awx/rsyslog /var/run/rsyslog /var/log/tower /var/log/nginx /var/lib/nginx; \
+RUN for dir in /home/awx /var/run/supervisor /var/lib/awx /var/lib/awx/rsyslog /var/lib/awx/rsyslog/conf.d /var/run/rsyslog /var/log/tower /var/log/nginx /var/lib/nginx; \
     do mkdir -p $dir; chmod -R g+rwx $dir; chgrp -R root $dir; done && \
     \
     for file in /etc/passwd /var/run/nginx.pid; \