Fix up spelling mistake
Fix up spelling mistake

Fixes bug 1253510

This was causing a KeyError when e2label didn't work

Change-Id: I0646409cdffa4d6d5d8b2c7a9e3c300022d1c9b8
(cherry picked from commit 22d1c2458623a1cfbb91a50c13f18329c863f70b)

rickerc/nova_audit,SUSE-Cloud/nova,TieWei/nova,rickerc/nova_audit,TieWei/nova,SUSE-Cloud/nova