Add playbook to setup the basic instance of gluster#175

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deepshikhaaa wants to merge 3 commits intomasterfrom

Commits on Oct 9, 2018

Add playbook to setup the basic instance of gluster which
deepshikhaaa
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Commits on Oct 11, 2018

Set dynamic group name of instance in rax module
deepshikhaaa
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Commits on Oct 25, 2018

Add requirements.yml for the base image of gluster playbook
Deepshikha
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