Apply conventions for Swift and Ceilometer

Use "swift" instead of "Swift".
Use "Telemetry" instead of "Ceilometer" where appropriate, lowercase
"ceilometer" as project name.
Reformat file common/section_objectstorage-features.xml.
Add some systemitem markup.

Partial-Bug: #1217503

Change-Id: Ia56a245a4993e4ea92fe19f38af443cf1bc411f5
Merge "Apply conventions for Swift and Ceilometer"