Allows set min/max share size that can be created in
extra_specs for each share_type.the share size will
be checked at API level as part of share create,
extend, shrink, migration_start. when manage share,
check it after get true size of share at manager layer.
new extra_specs keys are supported for set min/max
size of share.
'provisioning:max_share_size'
'provisioning:min_share_size'
Implements: blueprint share-size-limited-by-share-type
Change-Id: I5ce0fabf59bfca5ebaf0be5ffe9986e2b0480295
74415f6d4a