HS100 plugin not deleted after removing accessories and persist folders
<!-- Provide a general summary in the Title above -->

### Expected Behavior
<!-- running rm -rf ~/.homebridge/accessories and rm -rf ~/.homebridge/persist should remove all plugins -->
<!-- If you're suggesting a change/improvement, tell us how it should work -->

### Current Behavior
<!-- HS100 still loads when I start home bridge causing the error when it loads tplink-smarthome "Cannot add a bridged Accessory with the same UUID as another bridged Accessory" -->

### Steps to Reproduce (for bugs)
<!-- Deleted accessories and persist manually. Removed using commands in Terminal-->

### Versions
<!-- Please run commands and include versions below. -->
- **Node**:       `v6.10.2`
- **Homebridge**: `0.4.33`
- **OS**:         <!-- MacOS High Sierra 10.13.4 on a Mac Mini 2010 running as a server -->

### Configuration
<!-- Please include the TplinkSmarthome platform section of your config.json file.
Paste between the the two ``` lines below.
-->
```json
{
 "bridge": {
    "name": "Homebridge",
    "username": "CC:22:3D:E3:CE:30",
    "port": 51826,
    "pin": "031-45-155"
    },
 
 "accessories": [],
 "platforms": [
    {
        "platform": "TplinkSmarthome"
    }
]
}
```

### Homebridge Log / Command Output
<!-- Paste relevant output between the two ``` lines below
  - Remove any sensitive information, passwords, etc.
  - If output is long:
    - Please extract only the relevant portions if possible (remove other plugin's output, etc)
    - Consider creating a gist, etc
  - However, please include the beginning of the log where the homebridge initialization happens if possible
-->
```
[6/1/2018, 1:53:21 PM] Loaded plugin: homebridge-hs100
[6/1/2018, 1:53:21 PM] Registering platform 'homebridge-hs100.Hs100'
[6/1/2018, 1:53:21 PM] ---
[6/1/2018, 1:53:24 PM] Loaded plugin: homebridge-tplink-smarthome
[6/1/2018, 1:53:24 PM] Registering platform 'homebridge-tplink-smarthome.TplinkSmarthome'
[6/1/2018, 1:53:24 PM] ---
[6/1/2018, 1:53:24 PM] Loaded config.json with 0 accessories and 1 platforms.
[6/1/2018, 1:53:24 PM] ---
[6/1/2018, 1:53:24 PM] Loading 1 platforms...
[6/1/2018, 1:53:24 PM] [TplinkSmarthome] Initializing TplinkSmarthome platform...
[6/1/2018, 1:53:24 PM] [TplinkSmarthome] homebridge-tplink-smarthome v3.11.0, node v6.10.2, homebridge v0.4.42
[6/1/2018, 1:53:24 PM] Loading 0 accessories...
Load homebridge-hs100.Hs100
[6/1/2018, 1:53:24 PM] [homebridge-hs100.Hs100] homebridge-hs100 v3.7.0, node v6.10.2, homebridge v0.4.42
Setup Payload:
X-HM://0023ISYWY26IK
Scan this code with your HomeKit app on your iOS device to pair with Homebridge:
                                                    
Or enter this code with your HomeKit app on your iOS device to pair with Homebridge:
                       
    ┌────────────┐     
    │ 031-45-154 │     
    └────────────┘     
                       
[6/1/2018, 1:53:25 PM] Homebridge is running on port 51826.
[6/1/2018, 1:53:25 PM] [TplinkSmarthome] New Device Online: [Iron] plug [80060FBDFCAFCC61C9D60593C392FFD0188BD3E7] 10.0.1.23 9999
[6/1/2018, 1:53:25 PM] [TplinkSmarthome] Adding: [Iron] plug [80060FBDFCAFCC61C9D60593C392FFD0188BD3E7]
[6/1/2018, 1:53:25 PM] [homebridge-hs100.Hs100] New Device Online: [Iron] plug [80060FBDFCAFCC61C9D60593C392FFD0188BD3E7] 10.0.1.23 9999
[6/1/2018, 1:53:25 PM] [homebridge-hs100.Hs100] Adding: [Iron] plug [80060FBDFCAFCC61C9D60593C392FFD0188BD3E7]
/usr/local/lib/node_modules/homebridge/node_modules/hap-nodejs/lib/Accessory.js:264
      throw new Error("Cannot add a bridged Accessory with the same UUID as another bridged Accessory: " + existing.UUID);
      ^

Error: Cannot add a bridged Accessory with the same UUID as another bridged Accessory: 307b8da7-54f7-4ae3-8d19-315d3718af2c
    at Bridge.Accessory.addBridgedAccessory (/usr/local/lib/node_modules/homebridge/node_modules/hap-nodejs/lib/Accessory.js:264:13)
    at Bridge.Accessory.addBridgedAccessories (/usr/local/lib/node_modules/hom
```
