dumpstate.cpp changes to accomodate remote bugreports

Added four new commands to dumpstate() - route, printenv, netstat
and lsmod.
Added -R flag for remote bugreports, which will send
android.intent.action.REMOTE_BUGREPORT_FINISHED broadcast with an extra
SHA256 hash counted by a new method SHA256_file_hash(path).

Bug: 26154009
Change-Id: Ibd7cb8f38dfc8f0fa3fda3e56dcd04b7d1fe68b9