labs: remove quotation marks from snapshot names

The quotation marks around the snapshot names ended up as part of the
snapshot names on Linux. With the current code, removing the quotation
marks means that introducing whitespace into snapshot names would break
the Windows batch scripts.

Change-Id: I12d6e6889fdf6da6d90695a7168721687beb4f2b
Merge "labs: remove quotation marks from snapshot names"