Parsing of socket addresses
Symbolic socket names:
`Inet(ip,port): An internet socket with IP ip and the given port`Inet_byname(n,port): An internet socket with the IP resulting from
the resolution of the name n, and with the given port`Unix p: A Unix Domain socket with the path pUse Uq_resolver.sockaddr_of_socksymbol to convert to a
Unix.sockaddr (and resolve names).
Parses designations of the forms:
<IPv4>:port[<IPv4_or_IPv6]:port<name>:port/path./pathRaises Failure on parse error.