METRON-2079 Fix documentation for installing Ansible for fulldev Centos 6

[mmiklavc]

Contributor Comments

https://issues.apache.org/jira/browse/METRON-2079

The test for this is to install Ansible 2.6.5 via pip, per the instructions, and successfully deploy fulldev.

Per the comments in the Jira, this is a stopgap and will be superseded by https://issues.apache.org/jira/browse/METRON-1860.

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[merrimanr]

+1