Refs #106: remove ist_sst_ and unnecessary gcs_.join
Refs #106: remove if condition. call gcs_.join anyway when sst is done
Refs #106: add join flags to ist sender which means join back to cluster when it exits. it is introduced because sometimes sst_sent may not be called.
refs #139 - made PC send errors to match gcs core counterparts to
            have appropriate error codes from backend in gcs
            core sending.
Merge pull request #140 from codership/gh139

refs #139 - made PC send errors to match gcs core counterparts to  have appropriate error codes from backend in gcs core sending.
Refs #135: delay enough time to make sure test pass always
Refs #106: call gcs_join right after IST. otherwise node could serve IST or SST for only one node, which is not we expect
Refs #106: remove duplicate condition
Merge pull request #146 from codership/gh106

Gh106
regs #147 - refactored gcs closing to be able to do emergency close from gcs_recv_thread
refs #147 fixed assertions
refs #102 reserved 8 byte version field from EVS message, initial protocol upgrade for EVS and PC
Refs #135: add 'const' qualifier back
Refs #135: rollback
refs #102 - PC protocol version tied to EVS, unit tests
refs #153 ported fix from gh71 branch
Bumped version to 3.8.
Revert "refs #153 ported fix from gh71 branch"

This reverts commit b5c3115a00f8dcdd3c071dd9720e0a852d24081b.
refs #153 protect connection appropriately also on get_stats, other backend close related fixes
Merge pull request #150 from codership/gh147

regs #147 - refactored gcs closing to be able to do emergency close from...