merge Tether{Down,Up}stream4{Key,Value} - part 2 - java

Generated via:
  git grep 'Tether(Down|Up)stream4(Key|Value)' | cut -d: -f1 | sort -u | while read i; do
    sed -r -i 's@TetherUpstream4Value@Tether4Value@g' "$i"
    sed -r -i 's@TetherDownstream4Value@Tether4Value@g' "$i"
    sed -r -i 's@TetherDownstream4Key@Tether4Key@g' "$i"
    sed -r -i 's@TetherUpstream4Key@Tether4Key@g' "$i"
  done

  cd Tethering/src/com/android/networkstack/tethering
  git mv TetherUpstream4Key.java Tether4Key.java
  git mv TetherUpstream4Value.java Tether4Value.java

  git diff TetherDownstream4Key.java Tether4Key.java
  git diff TetherDownstream4Value.java Tether4Value.java
  git rm TetherDownstream4Key.java
  git rm TetherDownstream4Value.java

Fixup resulting 'import' duplication
  mcedit Tethering/apishim/31/com/android/networkstack/tethering/apishim/api31/BpfCoordinatorShimImpl.java
  mcedit Tethering/apishim/30/com/android/networkstack/tethering/apishim/api30/BpfCoordinatorShimImpl.java
  mcedit Tethering/apishim/common/com/android/networkstack/tethering/apishim/common/BpfCoordinatorShim.java
  mcedit Tethering/tests/unit/src/android/net/ip/IpServerTest.java

Test: N/A, requires follow up commit
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: I1dfc3108ca4bbd0cefc3420bc7e421594b62619c