When `eth_unsubscribe` is received in the proxy, ensure this request is forwarded through on the correct socket (the same socket that was used for the corresponding `eth_subscribe`).
Move subscription handling for `eth_subscribe` and `eth_unsubscribe` to RpcModifiers (in `rpc-manager` package).
For each `eth_subscribe` request, a new `RequestManager` is created. Since the endpoint property on the proxy class was updated to be a provider, the same provider was being assigned to each new `RequestManager` and thus creating multiple event handlers for each subscription created. To circumvent this, we are now creating a new provider for each `RequestManager`.
Co-authored-by: Pascal Precht <pascal.precht@googlemail.com>
**NOTE:** Running a dapp with `client: “vm”` does not work, however I am not sure if that is intentional in v5 or not.
**NOTE:** Running `embark test` in the demo DApp does work, although there is an error that I am assuming does actually pertain to this PR:
```
made request without listener: whisper:node:register
Trace:
at EmbarkEmitter.trace [as request] (/Users/emizzle/Code/__Github/embk-fw/embark/packages/embark/src/lib/core/events.js:142:13)
at new request (/Users/emizzle/Code/__Github/embk-fw/embark/packages/embark/src/lib/modules/geth/index.js:49:17)
at Plugin.loadInternalPlugin (/Users/emizzle/Code/__Github/embk-fw/embark/packages/embark/src/lib/core/plugin.js:117:10)
at Plugins.loadInternalPlugin (/Users/emizzle/Code/__Github/embk-fw/embark/packages/embark/src/lib/core/plugins.js:96:40)
at Engine.loadInternalPlugin [as registerModule] (/Users/emizzle/Code/__Github/embk-fw/embark/packages/embark/src/lib/core/engine.js:69:18)
at Engine.registerModule [as blockchainComponents] (/Users/emizzle/Code/__Github/embk-fw/embark/packages/embark/src/lib/core/engine.js:183:10)
at Engine.apply [as registerModuleGroup] (/Users/emizzle/Code/__Github/embk-fw/embark/packages/embark/src/lib/core/engine.js:104:18)
at registerModuleGroup (/Users/emizzle/Code/__Github/embk-fw/embark/packages/embark/src/cmd/cmd_controller.js:740:16)
at nextTask (/Users/emizzle/Code/__Github/embk-fw/embark/node_modules/async/dist/async.js:5324:14)
at next (/Users/emizzle/Code/__Github/embk-fw/embark/node_modules/async/dist/async.js:5331:9)
at /Users/emizzle/Code/__Github/embk-fw/embark/node_modules/async/dist/async.js:969:16
at callback (/Users/emizzle/Code/__Github/embk-fw/embark/packages/embark/src/lib/core/engine.js:47:9)
at Client.done (/Users/emizzle/Code/__Github/embk-fw/embark/packages/core/core/src/ipc.js:46:11)
at Client.emit (/Users/emizzle/Code/__Github/embk-fw/embark/node_modules/event-pubsub/es5.js:74:21)
at Socket.connectionClosed (/Users/emizzle/Code/__Github/embk-fw/embark/node_modules/node-ipc/dao/client.js:201:20)
at Socket.emit (events.js:198:13)
```
emizzle