clarify errors when listeners fail to bind

When using multiple listeners, the log messages can be
potentially misleading as to which listener fails to bind:

Before:

  INFO -- : unlinking existing socket=/tmp/unicorn.sock
  INFO -- : listening on addr=/tmp/unicorn.sock fd=3
  unicorn/socket_helper.rb:110:in `initialize': Permission denied - bind(2) (Errno::EACCES)

After:

  INFO -- : unlinking existing socket=/tmp/openxdms.sock
  INFO -- : listening on addr=/tmp/openxdms.sock fd=3
  FATAL -- : error adding listener addr=0.0.0.0:84
  unicorn/socket_helper.rb:110:in `initialize': Permission denied - bind(2) (Errno::EACCES)

0 files changed, 0 insertions, 0 deletions