various zones changes/fixes.

Added --recurse_zones option to 'list'
Added --fixed_ip option to 'list' to find a particular instance by IP
Fixed issue with 'show' when --recurse_zones=1 and specifying UUID

Squashed commit of the following:

commit 34e86d8209012817f6534bff31551edd32ec1fc1
Author: Chris Behrens <email address hidden>
Date: Thu Jun 23 09:35:09 2011 -0700

    only lookup the server details once for the show command

commit 3e3438cf903fc46fcf280c728b119f0214545251
Author: Chris Behrens <email address hidden>
Date: Thu Jun 23 07:39:18 2011 -0700

    if recursing zones, display UUID instead of Id

commit a42c63ad7af1bdb8604890d8c7302e730360e3e3
Author: Chris Behrens <email address hidden>
Date: Thu Jun 23 07:20:25 2011 -0700

    recurse zones fixes

commit 1fe63dcf98ec8e37307dcce0b63895ce88f31ce2
Author: Chris Behrens <email address hidden>
Date: Thu Jun 23 04:46:27 2011 -0700

    Add --fixed_ip and --recurse_zones options to shell 'list' command
    servers.list takes fixed_ip, project_id, and recurse_zones options now