Add an option for shorter rpc timeout.
Add an option for shorter rpc timeout.

ccm updateconf --short-rt sets the rpc timeout to 2 seconds instead of
the default 10 seconds.

umitunal/ccm,unusedPhD/ccm,AtwooTM/ccm,bcantoni/ccm,mike-tr-adamson/ccm,bcantoni/ccm,thobbs/ccm,kishkaru/ccm,mikefero/ccm,aboudreault/ccm,pombredanne/ccm,spodkowinski/ccm,mikefero/ccm,pcmanus/ccm,josh-mckenzie/ccm,thobbs/ccm,mike-tr-adamson/ccm,pcmanus/ccm,mambocab/ccm,pcmanus/ccm,mike-tr-adamson/ccm,slivne/ccm,oldsharp/ccm,tolbertam/ccm,jorgebay/ccm,tolbertam/ccm,jeffjirsa/ccm,EnigmaCurry/ccm