Removed forcing IPv4 protocol from python RPC server implementation
to be in correspondence with the RPC client implementation which is
used `platform default`. This had led to situation when "localhost"
was translated as 127.0.0.1 for the server (IPv4 protocol was used),
but the client translated it as "::1" and was trying to connect to
server using IPv6 protocol and was getting "ECONNREFUSED 111 Connection refused".
Change-Id: I44802eb1ea78f3b36ac664f0be7237e62084c234
Dmitriy Smirnov
63e9e5ad0b