Fix typo: SelectDslSomokeTest -> SelectDslSmokeTest.

Change-Id: Id7674ee81ccd3794e7e9019b2b597889ede58160
Reviewed-on: http://review.couchbase.org/41454
Reviewed-by: Sergey Avseyev <sergey.avseyev@gmail.com>
Reviewed-by: Michael Nitschinger <michael.nitschinger@couchbase.com>
Tested-by: Michael Nitschinger <michael.nitschinger@couchbase.com>