Fix warnings in storage/server.pp.

Updates the swift storage/server class so that we quote $pipeline
before doing a comparison check for the server type. This fixes
an issue where warnings would always get printed when using the
default $pipeline variable.

Fixes LP Bug #1171052.

Change-Id: I3076b6110f1a42c0e6c179d18952b0b013908f01
Merge "Fix warnings in storage/server.pp."