Simplify mrr daily tag expression

The number of tests executed is intentionally smaller,
as recently the runtime has gone up too much.

New numbers:
csit-vpp-perf-mrr-daily-master: 120
csit-vpp-perf-mrr-daily-master-2n-skx: 72
csit-vpp-perf-mrr-daily-master-3n-skx: 126

More details included as diff files.

+ Less per-testbed exceptions.
- Single/double links tags still set at two places.

Change-Id: I1149d3e52edf38c7d9d3e0160c533e35ae944d0d
Signed-off-by: Vratko Polak <vrpolak@cisco.com>