core: reset state if dnet_idc_update_backend has been failed.
pytests: made server node isolated - now server nodes do not know about each other.
pytests: added test case for checking correct handling situation when 2 backends from different nodes has equal group and ids.
tests: created config struct for create_nodes method and moved all argument to it.
Merge pull request #557 from shaitan/master

Reset state if dnet_idc_update_backend has been failed.
v2.26.3.32
pytests: fixed broken index tests - use common cluster for all test and isolated cluster for test_special_cases.
Merge pull request #559 from shaitan/master

pytests: fixed broken index tests - use common cluster for all test and ...
speed up dc recovery as don't spend time on pickling/unpickling data and concatenate files via cat.
Change file concatenation from calling cat to python file read+write
use shutil.copyfileobj to concatinate files
lookup: extended lookup address to return dnet_addr, not address string
v2.26.3.33
Merge branch 'master' of https://github.com/reverbrain/elliptics into dc-recovery-fix-on-cat
remove extra bracket
Disable only non-disabled backends at cleanup.
config: do not reparse config at each backend init - only if config was modified. Removed useless copying of an array at config methods.
Merge pull request #563 from shaitan/master

Optimized dnet_ioserv startup
Fixed code indent
Merge pull request #564 from shaitan/master

Fixed code indent