import: Normalize Slackbot String Comparison.
import: Normalize Slackbot String Comparison.

In very old Slack workspaces, slackbot can appear as "Slackbot", and
the import script only checks for "slackbot" (case sensitive).  This
breaks the import--it throws the assert that immediately follows the
test.  I don't know how common this is, but it definitely affected our
import.

The simple fix is to compare against a lowercased-version of the
user's full name.

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