Optimization to read the HwvtepNode from the cache.
JIRA: OVSDB-485
Currently in the HwvtepSouthbound plugin reads the HwvtepNode from the datastore.
Reading the HwvtepNode from the datastore ineffecient, even the same info
is present in HwvtepSouthbound plugin cache.
This review is avoid the HwvtepNode reads from the datastore and get it from the cache.
If the node is not present in the cache, then read from datastore.
Signed-off-by: Chandra Shekar S <chandra.shekar.s@ericsson.com>
Change-Id: I1f15ff31b195a79a1725e63882512b87d40c5838