Adds RPM Build SPEC file, init script and example config file

[tomponline]

This PR adds the following files

• nutcracker.spec - an RPM spec file
• nutcracker.init - an init script for starting nutcracker as a service in Redhat
• nutcracker.yml - an example config file installed by the RPM, but marked as "confignoreplace" to allow modifications after installation

[manjuraj]

Looks good overall :) Could you resubmit after incorporating the following comments:

• move the changes from contrib/ folder to scripts/ folder as the contrib folder corresponds to 3rd party libraries
• instead of including nutcracker.yml, could you just refer to nutcracker.yml in conf folder (Is that possible?)
• use 4 spaces indentation

[tomponline]

Hi, no problem I'll get those changes made.

Including the custom config from the source tarball will be fine, and I'll do the same for the init script too.

[tomponline]

One thing I have noticed is that if the config file is wrong, or if the program cannot start for another reason, perhaps there is something already listening on the same port. The program does not seem to return a non-zero error code and so the init script says "Starting nutcracker OK", even though it has not started.

Is it possible for nutcracker to return non-zero?

[manjuraj]

I fixed the non-zero exit status issue here: 67ad495