test-info.yml: remove private_interfaces from examples

We do not use this section in any of our current tests and I don't
forsee the need for this in the near future.

Signed-off-by: Sachin Prabhu <[email protected]>

Author: spuiuk

test-info.yml.example

@@ -1,7 +1,3 @@
-private_interfaces:
-  - "192.168.122.100"
-  - "192.168.122.101"
-
 public_interfaces:
   - "192.168.123.10"
   - "192.168.123.11"
@@ -17,4 +13,4 @@ test_backend: glusterfs
 
 premounted_shares:
   - "/testdir1"
-  - "/testdir2"
+  - "/testdir2"