relocate_sdk.py: Allow script to work with Python 2.4 and 3.
Python 2.4 does not support the 'b' string literal or the
keyword 'as' in exception handling. Python 3 does not accept
the old method of exception handling and defaults to unicode.
The b() function converts strings to bytes on Python 3 and
using sys.exc_info() avoids the exception handling syntax.
Signed-off-by: Konrad Scherer <Konrad.Scherer@windriver.com> Signed-off-by: Saul Wold <sgw@linux.intel.com>
