6981157: Improve UnknownHostException with EAI error details and other cleanups Summary: generify; remove compiler warnings, typos, casts; return status information via gai_strerror when getaddrinfo fails; show full stack of native failures Reviewed-by: michaelm, alanb

6981138: (process) Process.waitFor() may hang if subprocess has live descendants (lnx) Summary: Do exit status handling before trying to close streams Reviewed-by: alanb, dholmes