Bug 1254 - Added MatchConvertorImpl unit tests

 - FIXME - mask computation of PbbIsid match entry (both ways)
 - FIXME - add mask computation for ArpSpa and ArpTpa match entries
 - TODO - finish implementation of vlan vid match entry - isVlanIdPresent() is not set

Change-Id: I9ba5da086584db2e678a79486376a0f9de4b30f0
Signed-off-by: Michal Polkorab <michal.polkorab@pantheon.sk>