health monitor: config properties specify whether SMTP TLS is used

A few other minor cleanups.  The daemonized health monitor
seems to be working very well now.
report unhealthy instances at INFO level rather than ERROR

ERROR log messages should be reserved for cases where the
health monitor itself is not functioning properly (e.g,
when it can't send email.)
don't override the stdout log file name if it's already set
update to daemon-0.7
only include cloudcoder config props needed by health monitor

This avoids unnecessarily exposing config properties such
as usernames and passwords used by other CloudCoder components.
ignore cloudcoder.properties
fix typo