Installation fails when both rsyslog and syslog_ng are installed

[deevidh]

On Linux systems where rsyslog is installed but not enabled, the installation fails.

During the installation, these recipes are conditionally included:

include_recipe 'al_agents::selinux' if selinux_enabled?
include_recipe 'al_agents::rsyslog' if rsyslog_detected?
include_recipe 'al_agents::syslog_ng' if syslogng_detected?

The rsyslog_detected helper function only detects whether rsyslog is installed, not whether it is enabled. So the corresponding recipe is runs to configure for rsyslog and restart the service (which fails). It then never gets to the syslog_ng check/installation.