This commit to support exposing vendor specific options to application:

This commit to support exposing vendor specific options to application:

1) Define a structure defining the vendor specific options
2) Pass an array of vendor specific options needed with the call to OCDoResource
3) Vendor specific header options are checked against the range of acceptable vendor specific header options
4) Vendor specific header options are added to the pdu being sent
5) Vendor specific header options are parsed and added to OCEntityHandlerRequest and OCClientResponse structs
6) Rebased on to master
7) Adding a test case to occlient for sending vendor specific option
8) Adding The number of options to be sent and the ones received, also adding this infor to OCEntityHandlerRequest and OCClientResponse structs
9) Rebased on to master

Change-Id: I5d4c56028bf510fba57ad4fc440565fd4b87ca31