Configure subnets CIDR for BGP tests

The patch configures CIDR for subnets used in BGP tests because
when these tests are run simulteniuosly they tries to use the same
CIDR and fail with error "Available CIDR for subnet creation could not be found".

Related-PRODX: PRODX-30128
Change-Id: Ibfd1dbbbfa77f71cddfb3f40bcab957da4bcb8e5
1 file changed