Add an MOTD when logging into the vagrant instances

[dvonthenen]

Output of the MOTD when you log into either Vagrant instance:

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This host is running:
polly @ /usr/bin/polly
rexray @ /usr/bin/rexray

Sample commands for REX-Ray (can run on node0 or node1):
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Create a volume:
rexray volume create --volumename=node0vol --size=1

List volumes:
rexray volume


Sample commands for Polly (run on node0 only + must sudo su):
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Create a volume:
polly volume create --servicename=virtualbox --name=pollyvol --size=1

List volumes:
polly volume ls

Delete volume:
polly volume remove --volumeid=<Volume UUID>

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[codecov-io]

Current coverage is 67.95%

Merging #115 into master will not change coverage

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