Existing filters aren't deleted

[phuedx]

If a profile has previously been set, then the existing filter (created in profileService#setProfile) needs to be removed.

[phuedx]

According to Ariane Keller's "tc Packet Filtering and netem":

[Simple filter] deletion can only be done for a complete priority band.

profileService#setProfile simply has to be updated to set the prio of the filter as well as the flowid.