Clean up the environment before incr/decr test
Clean up the environment before incr/decr test

The incr/decr tests expect that the key doesn't exist
(or is 0) causing it to fail if the test is executed
multiple times in a row.

Change-Id: Ie0629778b9f9ef51d6107762ab9d6d6ecd337c99
Reviewed-on: http://review.couchbase.org/22257
Reviewed-by: Michael Nitschinger <97a35296d1b836d20f06df4c8d26a1141c9ad108@couchbase.com>
Tested-by: Trond Norbye <60edd2ef23891a753f231b0c6f161dc634079a93@gmail.com>

corbinu/couchnode,ronkorving/couchnode,ConnectedHomes/couchnode,KenanSulayman/couchnode,Bloutiouf/couchnode,actano/couchnode,couchbase/couchnode,GannettDigital/couchnode,ConnectedHomes/couchnode,jess-sheneberger/couchnode,brett19/couchnode,ronkorving/couchnode,GannettDigital/couchnode,kshmir/couchnode,corbinu/couchnode,kshmir/couchnode,ronkorving/couchnode,brett19/couchnode,couchbase/couchnode,actano/couchnode,KenanSulayman/couchnode,KenanSulayman/couchnode,jess-sheneberger/couchnode,couchbase/couchnode,ConnectedHomes/couchnode,actano/couchnode,couchbase/couchnode,jess-sheneberger/couchnode,ConnectedHomes/couchnode,corbinu/couchnode,KenanSulayman/couchnode,jess-sheneberger/couchnode,Bloutiouf/couchnode,GannettDigital/couchnode,ronkorving/couchnode,Bloutiouf/couchnode,brett19/couchnode,kshmir/couchnode,Bloutiouf/couchnode