[sr-dev] git:master: resolve.c: make dns query only on name that has valid syntax

[Juha Heinanen]

admin at sip-router.org writes:

> resolve.c: make dns query only on name that has valid syntax

the above was not accurate.  it is only checked that name consists of
characters that can appear in domain name. i had to add _ char to the
valid chars, because it appears in svr names although i have not found
an rfc that would have extended the valid character set with _ char.

-- juha