Removed the static usage of open_vSwitch from transactBuilder and made it a dynamic...

Removed the static usage of open_vSwitch from transactBuilder and made it a dynamic value.

The actual change is in TransactBuilder.java
-        List<Object> lists = Lists.newArrayList((Object)"Open_vSwitch");
+        List<Object> lists = Lists.newArrayList((Object)dbSchema.getName());

But this change of passing the databaseSchema to the TransactBuilder calls for changing a
few APIs across the library.

This fix is needed in order for hardware_vtep testing to proceed.

Change-Id: I3e923ab9edd8d0f6836704be0cb6bd209f5c0480
Signed-off-by: Madhu Venugopal <mavenugo@gmail.com>