Enable logs if '-d' command-line option is given.
Additional command-line options -
-v : print version
-h : print usage
Drone only:
-p <port-number> : use given port number for the RPC service
Currently these are printed at the end of init when we start waiting for
client connections - this was done so that this info doesn't get lost in
the barrage of init logs. The downside is if there is a crash during
init, we don't get to know the version/revision from the logs. With this
change this info is printed twice - first thing when we start and just
after init when we start waiting for client connections
* Changed drone exit code from -1 to 1 'coz typically exit codes are
between 0 and 255
* Detect and report drone TCP port bind failure
* In all the following drone errors are reported (including previous
commits) -
* Drone already running (TCP port bind failure)
* Drone executable not found
* Packet.dll not found (Win32 only)
* The following conditions should NOT be reported
* Start/Stop Ostinato
* Stop before 5sec
* Stop after 5sec
