tests: Check the value of srw in run_servers

In the case if Cocaine support is disabled we should check the value
of srw option. But not the fact if this option exists.
Merge branch 'master' of github.com:reverbrain/elliptics
client: added documentation for indexes
Merge pull request #421 from euroelessar/master

Documentation for indexes & dnet_run_servers fixes
Merge pull request #405 from IIoTeP9HuY/master

React shared library. Python tests fixes.
build: depend on 0.21.32+ eblob
cache: setting total_size
Merge with branch master
Merge branch 'master' of https://github.com/reverbrain/elliptics

Conflicts:
	debian/control
	elliptics-bf.spec

react-dev added to dependencies