packagegroup-webos-test: Remove netperf

* Old netperf recipe
  (meta-oe/meta-oe/recipes-benchmark/netperf/netperf_2.4.4.bb)
  does not specify LICENSE_FLAGS but the COPYING file there explicitly
  says that it can not be distributed for non-commercial purposes.

* Newer recipe
  (meta-oe/meta-networking/recipes-support/netperf/netperf_2.6.0.bb)
  says that explicitly and builds with dylan correctly fails with:
  ERROR: netperf was skipped: because it has a restricted license
         not whitelisted in LICENSE_FLAGS_WHITELIST

* And LICENSE_FLAGS were update a bit
  http://git.openembedded.org/meta-openembedded/commit/?id=85ab35f4edac91ecc180161e97c6698f1c10928b

Open-webOS-DCO-1.0-Signed-off-by: Martin Jansa <martin.jansa@lge.com>
Change-Id: Iff5642372fe996239f4ebe9ccb5ce0423b9e78d8
Reviewed-on: https://g2g.palm.com/2081
Reviewed-by: Herb Kuta <herb.kuta@lge.com>
Tested-by: Herb Kuta <herb.kuta@lge.com>
Reviewed-by: Build Verification
Reviewed-by: Susan Montooth <susan.montooth@lge.com>
Tested-by: Susan Montooth <susan.montooth@lge.com>