Revert "Remove framework code that has moved to frameworks/libs/net"

Revert "Use createRandomUnicastAddress from MacAddressUtils"

Revert "Add net-utils-framework-net to telephony-common"

Revert submission 1191997-net-utils-framework-net

Reason for revert: Droidcop-triggered revert due to breakage https://android-build.googleplex.com/builds/quarterdeck?branch=git_qt-qpr1-dev-plus-aosp&target=aosp_taimen-userdebug&lkgb=6208131&lkbb=6208273&fkbb=6208273, bug b/149551544
Reverted Changes:
Ib1c807d64:Use createRandomUnicastAddress from MacAddressUtil...
I9e0f297e0:Add net-utils-framework-net to telephony-common
Ieb8927f9a:Remove framework code that has moved to frameworks...

Change-Id: I2824f781babd9f7e0bb9df524dadf6b8397dcaa1