Command log to debug reconnects.

The content of this commit should be removed from the final fix.
Special debug log: "OpenVPN log" tag

The log shows all state commands, and notifies when bytecount values have not changed more than 3 times in a row.
Logbuffer copied to Logcat.
No new routes if openvpn is already running.

We cannot add routes to an existing openvpn session because it makes openvpn reconnect.
Merge branch 'bug/vpn-reconnect-sometimes-hangs' into develop