Hi: 
 I have some problem as building the StarlingX docker image. 
 When I built stx-nova through build-stx-base.sh, the process was stuck, and leave the error log as below.
 Please offer me some suggestions.
 Many thanks.

...
dirname /opt/loci/scripts/install.sh
/opt/loci/scripts/pip_install.sh /tmp/heat pycrypto pylint
packages='/tmp/heat pycrypto pylint'
pip install --no-cache-dir --only-binary :all: --no-compile -c /tmp/wheels/upper-constraints.txt --find-links /tmp/wheels/ /tmp/heat pycrypto pylint
DEPRECATION: Python 2.7 reached the end of its life on January 1st, 2020. Please upgrade your Python as Python 2.7 is no longer maintained. A future version of pip will drop support for Python 2.7. More details about Python 2 support in pip, can be found at https://pip.pypa.io/en/latest/development/release-process/#python-2-support
...
Ignoring sphinxcontrib-applehelp: markers 'python_version == "3.6"' don't match your environment
Ignoring sphinxcontrib-applehelp: markers 'python_version == "3.7"' don't match your environment
Ignoring scikit-learn: markers 'python_version == "3.6"' don't match your environment
Ignoring scikit-learn: markers 'python_version == "3.7"' don't match your environment
Looking in links: /tmp/wheels/
Processing /tmp/nova
ERROR: Package 'nova' requires a different Python: 2.7.5 not in '>=3.6'
command '/bin/sh -c /opt/loci/scripts/install.sh' returned a non-zero code: 1


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