We were getting problems with connection to RTSP device when revid was started from boot.
It seemed like system networking things were not given enough time to establish themselves
before we tried to use them. A delay before running revid fixes this, but is a bit of a
hacky solution. Better solution would be appreciated.
Improve debug and info logging quality and frequency
* cmd/rv: added some more debug and info logging
* revid: improving logging in revid.go
* revid: improved logging in senders.go
* revid: don't need to set log level as netsender does it
* added some extract log messages
Approved-by: Trek Hopton <trek.hopton@gmail.com>