Adding `teardown` to `test/fast/Listing versions/`

test/fast/Listing versions/Running "nvm ls" with node-like versioning vx.x.x should only list a matched version

@@ -8,3 +8,4 @@ nvm ls v0.1 | grep v0.1.2 &&
 nvm ls v0.1.2 | grep v0.1.2 &&
 nvm ls v0.1. | grep N/A &&
 nvm ls v0.1.1 | grep N/A
+

test/fast/Listing versions/teardown

@@ -0,0 +1,11 @@
+rmdir ../../../v0.0.1
+rmdir ../../../v0.0.3
+rmdir ../../../v0.0.9
+rmdir ../../../v0.1.2
+rmdir ../../../v0.1.3
+rmdir ../../../v0.2.3
+rmdir ../../../v0.3.1
+rmdir ../../../v0.3.3
+rmdir ../../../v0.3.9
+unalias nvm_has_system_node
+