so user does not have to use virtualenv python package for creating a
virtualenv, the "venv" module in Python3 would suffice.
see also https://docs.python.org/3/library/venv.html
Signed-off-by: Kefu Chai <kchai@redhat.com>
.. code:: bash
- [build]$ virtualenv -p python3 venv && source venv/bin/activate && pip3 install cmd2
+ [build]$ python3 -m venv venv && source venv/bin/activate && pip3 install cmd2
[build]$ source vstart_environment.sh && source venv/bin/activate && python3 ../src/tools/cephfs/cephfs-shell
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