Improve signal handling

- Fix memleak: RRelease the Signal JSON representation once used
- Change equality condition between signals
- Use a REALTIME clock to retrieve the timestamp if not provided by
the signal. This is the most simple to date a signal and
use that time for further usage.
- Add a method to retrieve the last_timestamp value from
a signal

This with the commit from ctl-utilities submodule
"8ff0fe3c454ea32ba383a3cfa9c4e91237d6c494" fixes the
issue.

Change-Id: Ifed66796f92d789c80f10b161318f6bef788dda7
Signed-off-by: Romain Forlot <romain.forlot@iot.bzh>

1 files changed, 0 insertions, 0 deletions

diff --git a/ctl-utilities b/ctl-utilities
-Subproject 44f5060de064d3acab585d26d8141df3f0481c6
+Subproject 8ff0fe3c454ea32ba383a3cfa9c4e91237d6c49