Kaifeng Wang f409a869ef Reformat instructions related with various OS
Follow up to "Ironic behind mod wsgi" documentation [1].

This reformats instructions and clears TODOs in the document,
similar places were found and fixed in this patch as well.

References to Fedora 21 are removed.

[1] https://review.openstack.org/#/c/407327

Change-Id: I3ded2614306df3f6ce4b1d14526b061dcaa7b829
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