Definitions for vertical scaling

REQ-053 A VNF supporting scalability will describe the different types of scalability supported (e.g. scale
up, scale down, scale in, scale out) and describe how each one is achieved, for instance
describing which VNFC(s) should be scaled. It shall be possible to specify these properties in the
VNFD.

The vertical scaling needs scale definitions:
1) The scale up/down should be associated with different compute resources ( memory, disk size, cpu count).
2) There should be profiles defined for scale up and separate profile defined for scale in. The profile consists of : mem size, disk size and cpu count at minimum.