add debug logging to figure out why cert/key generation is sometimes slow
add debug logging to figure out why cert/key generation is sometimes slow

the cert generation tests failed a few times on CI which makes us suspicious
that some random number generation is slow. we scattered some debug statements
to help us figure out which part is slow

[#143253409]

Signed-off-by: John Shahid <d5f6a919b5b5e6a4f7f09f1adf45e90e5c38b58e@gmail.com>

cloudfoundry-incubator/executor