spec fix invalid user creations
spec fix invalid user creations

users should only be on root_accounts

refs CNVS-21700

Change-Id: I0e54a0dd6faedfa5fdfadb728637ffb0a2413b53
Reviewed-on: https://gerrit.instructure.com/57695
Reviewed-by: James Williams  <3a5f4ed991dbfa5c9ef76ad729d240ca12f62180@instructure.com>
Tested-by: Jenkins
Product-Review: Jacob Fugal <f862f167b85d41b225785c70d70808bc7337c1fe@instructure.com>
QA-Review: Jacob Fugal <f862f167b85d41b225785c70d70808bc7337c1fe@instructure.com>

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