disable python-xdist for now

Author: vladak

tools/setup.cfg

@@ -2,5 +2,5 @@
 test=pytest
 
 [tool:pytest]
-addopts = -vv --color=yes --numprocesses=auto
+addopts = -vv --color=yes
 testpaths = src/test/python

tools/setup.py

@@ -45,7 +45,6 @@ def readme():
     tests_require=[
         'pytest',
         'GitPython',
-        'pytest-xdist',
         'mockito>=1.3.3',
         'pytest-mockito',
     ],