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Add retry logic with exponential backoff to KerberosCredentialsManager
for addition of managed accounts. This will cover the cases when the
first attempts fail because network is not ready yet, for example.
Network instabilities are common on first user login because
OpenNetworkConfigurations often changes network config on ChromeOS.

Bug: 1049331
Change-Id: I74b91cfd6fda3fc923061050a97fcb791761815e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2039453
Commit-Queue: Felipe Andrade <fsandrade@chromium.org>
Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
Cr-Commit-Position: refs/heads/master@{#746481}