Fixed DeprecationWarning in exc_filters

DeprecationWarning: BaseException.message has been deprecated as of Python 2.6
This warning was generated in exc_filters during exception conversions.
Fix it by removing access to deprecated attribute

Closes-Bug: #1257530

Change-Id: I8ff8b974946ecab13f12a70b315dd94c3453197e
Merge "Fixed DeprecationWarning in exc_filters"