Accounts declared in the flow.json are not created when emulator is launched

https://github.com/onflow/flow-emulator/issues/405

from flow-emulator repo by @cybercent

###Instructions

flow accounts create adds and account to the flow.json file.

When relaunching the emulator the accounts defined in the flow.json are not recreated.

There should be a command to recreate the accounts defined in the flow.json file.

###Problem

Accounts defined in flow.json not present in emulator.

Steps to Reproduce

{
"accounts": {
"AccountA": {
"address": "01cf0e2f2f715450",
"key": "some_private_key"
},
"AccountB": {
"address": "179b6b1cb6755e31",
"key": "some_private_key"
},
"AccountC": {
"address": "f3fcd2c1a78f5eee",
"key": "some_private_key"
},
"default": {
"address": "01cf0e2f2f715450",
"key": "some_private_key"
},
"emulator-account": {
"address": "f8d6e0586b0a20c7",
"key": "some_private_key"
}
},
"deployments": {
"emulator": {
"default": [],
"emulator-account": []
}
}
}

###Acceptance Criteria

There should be a command to recreate the accounts defined in the flow.json file.