updated hacking rules

1) Added comment for H231, which we were already enforcing. H231
is for Python 3.x compatible except statements.

2) Added check for H201, which we were enforcing in reviews
but waiting on hacking checks to be updated. H201 is for bare
except statements, and the update in upstream hacking is to
support the "  # noqa" flag on it.

The H201 check catches some existing bare excepts that are fixed.

Change-Id: I68638aa9ea925ef62f9035a426548c2c804911a8
Merge "updated hacking rules"