Make retry_command output easier on the eyes.

Silent all the "on" commands by passing silent => true to the underlying
host.exec in the options map. Instead, handle console/logfile output for
retry_command manually. Should significantly reduce logfile size for
applications that make extensive use of retry_command, not to mention making
stdout more readable.

Signed-off-by: Wayne <wayne@puppetlabs.com>
Remove call to logger.notify with bogus arity.

Seems like "args" probably becomes an empty array which made this method call
okay previously. However, if there are no arguments in "*args" then no args get
passed down to optionally_color, thus the arity of the original "*args" is
preserved.

Signed-off-by: Wayne <wayne@puppetlabs.com>