Fixes ofport_request column setter. Open_vSwitch defines ofport_request as an
integer, not a String. The setOpenFlowPortRequest() method was modified to
take Set<Integer> instead of String.
Change-Id: I95e4a015aa53015fee2a9802e4f034951bed2b47 Signed-off-by: Ryan Goulding <ryandgoulding@gmail.com>