Setup unable to run - uap v1.0

[cmeesters]

Dear Developers,

I only tested it yesterday, perhaps the issue is solved in the trunk, yet for the sake of possible improvements:

`$ python3 setup.py build
Traceback (most recent call last):
File "setup.py", line 15, in
subprocess.call(check_tools[tool])
File "/usr/lib/python3.7/subprocess.py", line 323, in call
with Popen(*popenargs, **kwargs) as p:
File "/usr/lib/python3.7/subprocess.py", line 775, in init
restore_signals, start_new_session)
File "/usr/lib/python3.7/subprocess.py", line 1522, in _execute_child
raise child_exception_type(errno_num, err_msg, err_filename)
FileNotFoundError: [Errno 2] No such file or directory: 'virtualenv': 'virtualenv'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "setup.py", line 17, in
if e.errno == os.errno.ENOENT:
AttributeError: module 'os' has no attribute 'errno'`

HTH,
Kind regards,
Christian Meesters