Remove Flags

These were reading system properties which caused security warnings in
some cases. Removing to allow us to do a more comprehensive design.

This reverts commit 0a6e9e56f7f3ac7750b38eaba83639ad47a2692f.
This reverts commit 3dba023d4fb47882fa215715c196cfa3be30c098.

Test: test.py --host
Change-Id: I04e8b7a934540b250e6fc56f5aa6ce7f18131d4d