HP 3PAR drivers should not claim to have 'infinite' space

The HP 3PAR drivers report 'infinite' space when there is not a limit
set on the CPG. In this case, it would be better to at least use the
free space estimate of the array instead of 'infinite'.

Change-Id: I8c34ea3982fe61a1b6fa01245ca6da23ca5b8b7b
Closes-Bug: 1369057
Merge "HP 3PAR drivers should not claim to have 'infinite' space"