[Varnish] #1813: Duplicate -a leads to assert instead of error message.

[Varnish]

#1813: Duplicate -a leads to assert instead of error message.
----------------------+-------------------
 Reporter:  lkarsten  |      Owner:
     Type:  defect    |     Status:  new
 Priority:  normal    |  Milestone:
Component:  varnishd  |    Version:  4.1.0
 Severity:  normal    |   Keywords:
----------------------+-------------------
 On 4.1.0, if you add the same -a twice, you get this error:

 {{{
 varnish> root at lima:/etc/varnish# varnishadm panic.show
 Last panic at: Mon, 02 Nov 2015 10:20:15 GMT
 Assert error in vca_acct(), cache/cache_acceptor.c line 490:
   Condition((listen(ls->sock, cache_param->listen_depth)) == 0) not true.
 errno = 98 (Address already in use)
 thread = (cache-acceptor)
 version = varnish-4.1.0 revision 3041728
 ident =
 Linux,3.16.0-4-amd64,x86_64,-junix,-smalloc,-smalloc,-hcritbit,epoll
 Backtrace:
   0x433505: varnishd() [0x433505]
   0x410f65: varnishd() [0x410f65]
   0x7f78a92230a4: libpthread.so.0(+0x80a4) [0x7f78a92230a4]
   0x7f78a8f5804d: libc.so.6(clone+0x6d) [0x7f78a8f5804d]
 }}}

 Child is continously being restarted.

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Ticket URL: <https://www.varnish-cache.org/trac/ticket/1813>
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