Adds or removes validator by its signature public key hash to list of validators allowed to work in emergency mode
#### CLI Example
`Command syntax:`
```actionscript
esbocs emergency_validators {add|remove}
-net <net_name>
[-chain <chain_name>]
-cert <poa_cert_name>
-pkey_hash <validator_pkey_hash>
```
`Options:`
```actionscript
-net - name of the Cellframe Network. The list of networks can be found in the <Config_dir> \ etc \ network folder or received by The Cellframe-Node-CLI using command - net list
-chain - the name of Chain. The list of chains can be found in the directory <Config_dir> \ etc \ network \ <network_name> or by the Cellframe-Node-CLI using command - net list chains (optional)
-cert - name of the root node certificate
-pkey_hash - public key hash of the validator
```
Example:
`Command:`
```actionscript
cellframe-node-cli esbocs emergency_validators add
-net riemann
-chain main
-cert riemann.root.pvt.0
-pkey_hash 0x327DF692D5918F7A62BC478B04E10892084DDCA801EAF35710BD40C9DCEBF95D
```
`Response:`
```actionscript
Emergency validator: 0x327DF692D5918F7A62BC478B04E10892084DDCA801EAF35710BD40C9DCEBF95D
status: added
Decree hash: 0x26265CE750F525C2F4455FDCAC4E7E467A12CF0E01832DAF0568168B662295E3
```
#### JSON-RPC Example
`Command:`
```actionscript
curl --unix-socket /opt/cellframe-node/var/run/node_cli
-X POST http://localhost/connect
-d '{"method":"esbocs", "params":["esbocs;emergency_validators;add;-net;riemann;-chain;main;-cert;riemann.root.pvt.0;-pkey_hash;0x327DF692D5918F7A62BC478B04E10892084DDCA801EAF35710BD40C9DCEBF95D"], "id":"1"}'
```
`Response:`
```json
{
"type": 2,
"result": [
{
"Emergency validator": "0x327DF692D5918F7A62BC478B04E10892084DDCA801EAF35710BD40C9DCEBF95D",
"status": "added",
"Decree hash": "0xC94C83BBA517053BAA8D0A82753EC5263B5B66D97B1C0FED358B383F2AFF78AB"
}
],
"errors": null,
"id": 1
}
```