rename of dnsmasq module to dns, adding bind-utils

[Tomáš Čech]

Package bind-utils is working correctly and I can't see any problem but it
makes `guix lint' cry:

$ guix lint bind-utils
;;; Failed to autoload make-session in (gnutls):..tive]...
;;; ERROR: missing interface for module (gnutls)
Backtrace:
In ice-9/boot-9.scm:
 157: 12 [catch #t #<catch-closure 96bbe0> ...]
In unknown file:
   ?: 11 [apply-smob/1 #<catch-closure 96bbe0>]
In ice-9/boot-9.scm:
  63: 10 [call-with-prompt prompt0 ...]
In ice-9/eval.scm:
 432: 9 [eval # #]
In ice-9/boot-9.scm:
2401: 8 [save-module-excursion #<procedure 988940 at ice-9/boot-9.scm:4045:3 
()>]
4050: 7 [#<procedure 988940 at ice-9/boot-9.scm:4045:3 ()>]
1724: 6 [%start-stack load-stack #<procedure 993100 at ice-9/boot-9.scm:4041:10 
()>]
1729: 5 [#<procedure 99fea0 ()>]
In unknown file:
   ?: 4 [primitive-load "/Devel/git/guix/scripts/guix"]
In guix/ui.scm:
 849: 3 [run-guix-command lint "bind-utils"]
In srfi/srfi-1.scm:
 619: 2 [for-each #<procedure 11969a0 at guix/scripts/lint.scm:563:20 (spec)> #]
 619: 1 [for-each #<procedure 28ca720 at guix/scripts/lint.scm:475:14 
(checker)> #]
In guix/scripts/lint.scm:
 287: 0 [validate-uri # # home-page]

guix/scripts/lint.scm:287:16: In procedure validate-uri:
guix/scripts/lint.scm:287:16: In procedure module-lookup: Unbound variable: 
make-session


So, please review this one more carefuly than usual.

Thanks in advance.

S_W