Commits on Feb 18, 2016

1. Use environment marker for conditional requirements …

   Managing different requirements files for different python version
   requires much more efforts when the requirements became too complex.
   
   This issue emerged when a required package `stevedore` decide not
   supporting Python 2.6 since version `1.11.0`.
   
   ```
   >>> import stevedore
   Traceback (most recent call last):
     File "<stdin>", line 1, in <module>
     File "/usr/lib/python2.6/site-packages/stevedore/__init__.py", line 23, in <module>
       LOG.addHandler(logging.NullHandler())
   AttributeError: 'module' object has no attribute 'NullHandler
   ```
   
   Pip provides a feature named [Environment
   Markers](https://www.python.org/dev/peps/pep-0496/) for requirements
   file to include specific packages conditionally which could properly
   solve this issue.
   
   This fix:
   1. Use environment markers and merge python version specific
   requirements files;
   2. Remove python version specific requirements files references in
   `Makefile` and Travis configuration;
   3. Use `pip install -r requirements.txt` to replace per-line package
   installation;
   4. Restrain package `stevedore` on Python 2.6 to `1.10.0`.
   
   Signed-off-by: Hao Liu <hliu@redhat.com>

   

   Hao-Liu committed Feb 18, 2016
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