Doc bug fixes for Identity/keystone Grizzly updates.

fix bug 1071424 - PKI is now default for keystone
fix bug 1074191 - New config file fields for LDAP
fix bug 1103040 - With new config file fields, names like itsec go away
fix bug 1111773 - Re-emphasizes that you must have middleware for s3
fix bug 1130249 - Fixes user-update param confusion in Identity doc

Change-Id: Id21aa27944a0fb68ebfdf20e77fb94950ac141c3
Merge "Doc bug fixes for Identity/keystone Grizzly updates."