scripts: Refactoring: variables naming
raava.zoo, gns.zclient: removed copypaste with zoo.connect()/zoo.Connect(), implemented some options support for kazoo
services: config_attrs -> config_opts
gns.zclient: using contextmanager for Connect()
gns.zclient: renamed Connect() to ClientContext()
gns-reinit: argv_list -> argv
zclient: ClientContext -> get_context
Merge pull request #45 from mdevaev/zoo-client-refactoring

Zoo client refactoring