GetServerInfo: Return archive format names as lower case

Clients can make use of the the archive format names returned by the
GetServerInfo REST endpoint to retrieve the archive in a specific
format by using the GetArchive REST endpoint. The GetArchive REST
endpoint requires the archive format in lower case. Hence the
GetServerInfo REST endpoint should return the archive format names in
lower case, so that clients don't need convert the archive format
names to lower case on their own.

Change-Id: Idce4473f0ce7bdec744b9f60116f1bbd01f76bcd
Signed-off-by: Edwin Kempin <edwin.kempin@sap.com>
2 files changed