attach use context current block instead of block num passed as a parameter

Marcinrequested to merge
mi_attach_and_detach_commit into develop
  • change attach interface, passing a block num is no longer required, context's current_block_num is taken instead
  • remove the procedure for detaching contexts
  • fix live sync test to deal with WAL

dependant applications MRs : hivemind: hivemind!662 (merged) btracker: balance_tracker!74 (merged) hafbe: haf_block_explorer!152 (merged) hafah: HAfAH!114 (merged)

Edited by Bartek Wrona

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