session: implemented bulk_remove() method
pytests: since timeout is long now update session parameter test to reflect that
package: depend on blackhole 0.2.0-0rc10
v2.26.3.13
client: Don't lose trace_id at timeout
client: Recover files on read also for -EILSEQ

This error means "checksum check failed", so data is corrupted
client: Fixed checkers at merge_indexes
client: Throw -EPROTO if we connected to wrong addr
server: Fixed io queue limits

We should also consider backends' own pools
Merge pull request #504 from euroelessar/master

Fixed several errors
v2.26.3.14
Python: completely removed old interface elliptics.Session.get_routes and used new elliptics.Session.routes wherever needed.
tools: added '-n/--check_nodes' option to dnet_balancer for printing only nodes spread without route-list.
merge recovery: added user-friendly log when group has only one node with one backend.
monitor: now monitor listen the same net family as the node does.
Pytests: added monitor statistics to log.
Pytest: marked each test case by unique trace_id.
Monitor: moved config of disabled backend to 'backend->config'