Merge from Widevine repo of http://go/wvgerrit/128047
There have been some failures with various RSA private keys. We add
them to the unit tests to make sure that OEMCrypto is able to load
these types of keys:
* Shorter: than normal private exponents. This seems to occur
occasionally even with Euler totients. But it occurs more with
Carmichael totients.
* 0-leading-byte: private exponents. This also occurs naturally for
both Euler and Carmichael totients.
* Carmichael: vs Euler totients. I think we may already have tests for
this. But just in case.
Bug: 190450051
Test: ran unit tests on bonito (and they passed!)
Change-Id: Id64ec738479eb8a0f77e253bace319cebe918d3f
