Adds Python requirements

requirements.txt

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+eventlet
+keystoneauth1
+keystonemiddleware
+PyMySQL
+oslo.concurrency
+oslo.config
+oslo.context
+oslo.db
+oslo.i18n
+oslo.log
+oslo.messaging
+oslo.middleware
+oslo.serialization
+oslo.service
+oslo.versionedobjects
+paramiko
+paste
+pbr
+psutil
+python-cinderclient
+python-glanceclient
+python-keystoneclient
+python-neutronclient
+python-novaclient
+python-barbicanclient
+pyVmomi
+pywinrm
+PyYAML
+requests
+sqlalchemy
+webob