Be able to run full and light client simultaneously (with portshift)

[Tbaut]

As the title says, we should be able to run both clients on the same machine as long as there is a port-shift:

$ parity --light # Run light client
$ parity --ports-shift 100 # Run full client with ports-shift

Light and full clients should use separated directories, the keys should be shared.
A particular attention should be paid to the directory code as it varies between platforms. Proper tests should be performed.

[Tbaut]

Not possible without specifying a different directory for each call.

[Tbaut]

I guess we should make sure they run per default on different directories.
The keys should be shared.

[5chdn]

I don't see why this is relevant. It has never been possible to run two instances with the same data directory.