Improving manual install docs
Improving manual install docs

Reasons:
 - manual install docs are outdated;

Changes:
 - doc improvement;

Change-Id: I3580293eb92e9063b3989a852e8e80715a09156b
Closes-Bug: #1342697

cp16net/trove,hplustree/trove,redhat-openstack/trove,cp16net/trove,fabian4/trove,mmasaki/trove,cp16net/trove,openstack/trove,fabian4/trove,openstack/trove,zhangg/trove,hplustree/trove,zhangg/trove,mmasaki/trove,mmasaki/trove,redhat-openstack/trove,fabian4/trove,redhat-openstack/trove