Repurpose SHA1PRNG_SecureRandomTest.

It's currently a test of harmony's SHA1PRNG implementation but
might be generally useful as a SecureRandomTest. A couple of test
cases fail with the stock Android provider. They will have to be
investigated.

(cherry picked from commit a0f58d519eb1efbf182963d5e3b1274bba6d43bb)

Change-Id: I9a6930ae3f8a065f51c457b15f6e669ea2c38982
2 files changed