Remove empty base/comparison.jl
Fix inconsistent capitalization of type abbreviations in socket.jl

UdpSocket -> UDPSocket
TcpSocket -> TCPSocket
IpAddr -> IPAddr
export TCPSocket as well
add type name changes to deprecate.jl
Merge pull request #8175 from JuliaLang/jcb/samecaps

 Keep acronyms all upper-case