This was agreed when discussing PRO-2015-0731R03

Alignment with agreed CR PRO-2015-0731R03 (change 12)

1) Removed include statement for subscription resource, 2) in
documentation text,, replaced "m2m:permittedBooleanValues" with
"restricted list of xs:boolean" (as agreed in PRO-2015-0731R03 change
11)

Added requestReachability attribute

This reverts commit ba30bd35.