This reverts merge request !72

[*] small fix: if dap_chain_cs_dag_proc_treshold() was able to move some events into chain, it needs to be run again

[*] Move VPN related command from NET module to VPN module

[*] Fix verification of emission
[*] Fix double reply in  tx_verify

[-] Remove mining dependency from a lot of modules
[-] Remove srv-vpn dependency from modules/net

Revert "[*] dap_chain_node_mempool_process() now processes not only transactions but also other event types"

This reverts commit b726fc32

This reverts commit 13afbcb1