Install Guide: Instruct to set hostname

Add explicit instructions to set the hostname of the nodes.

Change-Id: I2794e4a64c88d89ce28fb8889fee0d35ac542593
Closes-Bug: #1315555
removed	introductive comment in configuration example

To avoid confusions about the location of the configuration example
it's better to not mention it at all directly in the configuration
example.

Change-Id: I2668a563bfc41c30cfe44b1630455dc5a49e4133
use zypper dist-upgrade instead of zypper update

I think it's better to use zypper dist-ugrade instead of
zypper update to make sure that packages of higher versions
maybe avaialble in the OBS repositories are applied.
zypper update will not apply them because a vendor-change
is necessary.

Change-Id: Ia735ec0a15e27c8e90955c388235cfc520cd21cb
removed duplicated fors

Change-Id: Ia10ff5a7559b915b460af0a34e664228e40824e4
Merge "removed	introductive comment in configuration example"
Edits in admin-guide-cloud

Move all blockstorage related section files into its own subdirectory
like it is done for other section files.

Follow conventions for service names/project names and capitalization.

Change-Id: Ibaa14ca926975c37305f3a08fa1f4e7d50eea605
Merge "use zypper dist-upgrade instead of zypper update"
Merge "removed duplicated fors"
Merge "Install Guide: Instruct to set hostname"
Merge "Edits in admin-guide-cloud"