Fixes root_helper copy and paste problem with openstack-config

The documentation asks the user to use openstack-config to apply
a change to the root_helper parameter. With the way that
openstack-config works it expects parameters to be organised properly.
Therefore, any white space between arguments is assumed to be
a seperate argument, hence it is ignored; the solution is to
parenthesise the parameter required, encompassing all white space.

Note: Rebased since https://review.openstack.org/#/c/74243/

Change-Id: I2ab702d97828311f3fa409b6cb88931cd5f6c315
Closes-Bug: #1281565
backport: havana
Fix syntax error in controller node sql setup

The mysql shell command has redundant prompt which leads to incorrect
sql command, this patch simply removes the unnecessary characters.

Note, this patch also adds a single space after each prompt character
'>', this is same to the real mysql shell environment.

Change-Id: I3980d79dee88dcdf7add541bda59d97bf670be01
Closes-Bug: #1282039
Merge "Fixes root_helper copy and paste problem with openstack-config"
Merge "Fix syntax error in controller node sql setup"