ZTS: remove dead cleanup code from snapshot tests

Caught during path cleanups, the files referenced do not appear to be
created or used anywhere.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: bunder2015 <omfgbunder@gmail.com>
Closes #7508

tests/zfs-tests/tests/functional/snapshot/snapshot_002_pos.ksh

@@ -68,10 +68,6 @@ function cleanup
                 log_must rm -rf $TESTDIR/* > /dev/null 2>&1
         fi
 
-	if [[ -e /tmp/zfs_snapshot2.$$ ]]; then
-		log_must rm -rf /tmp/zfs_snapshot2.$$ > /dev/null 2>&1
-	fi
-
 }
 
 log_assert "Verify an archive of a file system is identical to " \

tests/zfs-tests/tests/functional/snapshot/snapshot_006_pos.ksh

@@ -67,10 +67,6 @@ function cleanup
                 log_must rm -rf $TESTDIR1/* > /dev/null 2>&1
         fi
 
-	if [[ -e /tmp/zfs_snapshot2.$$ ]]; then
-		log_must rm -rf /tmp/zfs_snapshot2.$$ > /dev/null 2>&1
-	fi
-
 }
 
 log_assert "Verify that an archive of a dataset is identical to " \