Fix for "nova help list" command

The output of "nova help list" shows several argument as "Admin Only",
when they are not.
This patch modifies help notes for --ip, --ip6 and --instance-name,
which can be used by regular users.

DocImpact

Change-Id: Iac541ac8e698a27348b437ad53910bd09ea7f257
Closes-Bug: #1295126
Synced jsonutils from oslo-incubator

The sync includes change that drastically enhances performance on Python
2.6 with fresh simplejson library installed.

The latest commit in oslo-incubator:
- 732bdb6297eb9de81667f7713ebcb1ccc2ee45a7

Change-Id: Ib3dc0b713ed90396919feba018772243b3b9c90f
Closes-Bug: 1314129
Fix documentation for config_drive boot parameter

The "config_drive" boot parameter only accepts a Boolean parameter, but
the documentation says otherwise.

Change-Id: I7cbf5aefbd006d8b5425cd8592bacb5d8435b3c9
Closes-Bug: #1314395
Merge "Synced jsonutils from oslo-incubator"
Merge "Fix for "nova help list" command"
Merge "Fix documentation for config_drive boot parameter"