Currently Guest-Client logs are written to syslog's daemon facility
with 'debug' level, however syslog conf in tis-centos-guest.img only
has 'info' level turned on for daemon facility.
Change the debug level to 'info' so that Guest-Client logs can be
written to /var/log/messages. This will help debugging future guest
heartbeat issues.
Also fix typo in guest_heartbeat_enabled_state_health_check() trace.
Change-Id: Iab72cce9be2986c6cafb79fa66aed6edfb36f32d
5d65b0a6a7