no-get-exception

We created a function, ansible.module_utils.pycompat24.get_exception to help retrieve exceptions in a manner compatible with Python 2.4 through Python 3.6. We no longer support Python 2.4 and Python 2.5 so this is extraneous and we want to deprecate the function. Porting code should look something like this:

# Unfixed code:
try:
    raise IOError('test')
except IOError:
    e = get_exception()
    do_something(e)
except:
    e = get_exception()
    do_something_else(e)

# After fixing:
try:
    raise IOError('test')
except IOErrors as e:
    do_something(e)
except Exception as e:
    do_something_else(e)