Run VPCS devices on cloud servers

This PR makes VPCS devices work in the cloud project case.  It also filters devices in the device dock to only show local or cloud devices, depending on if the user currently has a cloud project or local and remote project open.

The url for the iouyap binary on Github also changed and was updated in the code.

gns-165
VPCS 0.6 has been released now by the upstream author, which includes all the changes made by GNS3. 
```
wget -O vpcs http://sourceforge.net/projects/vpcs/files/0.6/vpcs_0.6_Linux64/download 
```
may be a better alternative