Merge branch 'master' into test-runner

cfg/core_cfg.cfg_tmpl

cfg/tarantool_feeder_cfg.c

cfg/tarantool_feeder_cfg.cfg_tmpl

cfg/tarantool_feeder_cfg.h

cfg/tarantool_silverbox_cfg.c

cfg/tarantool_silverbox_cfg.cfg_tmpl

cfg/tarantool_silverbox_cfg.h

cfg/warning.c

core/admin.c

core/admin.rl

core/tarantool.c

core/tbuf.c

include/tarantool.h

include/tbuf.h

mod/feeder/feeder.c

mod/feeder/feeder_cfg.cfg_tmpl

mod/silverbox/assoc.h

mod/silverbox/box.c

mod/silverbox/box_cfg.cfg_tmpl

test/box/args.result