* all logging packages have a custom implmentation for logread,
which is a command that can be invoked to view the logs. Hence,
it makes sense for logmngr to have a logread to accompany it
as well. Support for the same is added via this commit.
* the approach is simplistic and follows syslog-ng with the
slight enhancement of reading the logfile from logmngr uci
* support to generate default uci config for logmngr which is
to write logs to /var/log/messages
