AAL/Python: prevent tag adapter code from changing model state
AAL/Python: prevent tag adapter code from changing model state

Before this patch a tag adapter that changed model state easily
resulted in a confusing model error from test generation heuristics.
This patch immediately gives an error message when tag adapter
has changed model state.

yoonkiss/fMBT,yoonkiss/fMBT,mixu-/fMBT,01org/fMBT,mixu-/fMBT,yoonkiss/fMBT,violep01/fMBT,yoonkiss/fMBT,mixu-/fMBT,01org/fMBT,mixu-/fMBT,01org/fMBT,yoonkiss/fMBT,violep01/fMBT,violep01/fMBT,01org/fMBT,01org/fMBT,violep01/fMBT,violep01/fMBT,mixu-/fMBT