Add logging to RenewCrypto
Add logging to RenewCrypto

As the LURenewCrypto is a pain to debug, this patch
adds a lot more logging of events to the method.
Note:
- As renew-crypto is a relatively rarely used operation
  in a normal production cluster, this won't clutter up
  real user's log files.
- Most of the messages are in debug mode, so they would
  anyway just show up in log files of clusters run in
  debug mode (as for example our QA clusters.
- A few log messages are in error mode, which is
  intentional as they log more details about the errors
  than is given in the feedback functions.

Signed-off-by: Helga Velroyen <2d0126b1ec6f9ec5cbec4a7012aa14faeaef10f5@google.com>
Reviewed-by: Klaus Aehlig <4ce51de36d9068cd7db2eec1151e0f3f95419008@google.com>

bitemyapp/ganeti,andir/ganeti,leshchevds/ganeti,mbakke/ganeti,andir/ganeti,ganeti/ganeti,onponomarev/ganeti,grnet/snf-ganeti,onponomarev/ganeti,leshchevds/ganeti,yiannist/ganeti,ganeti/ganeti,yiannist/ganeti,grnet/snf-ganeti,leshchevds/ganeti,bitemyapp/ganeti,yiannist/ganeti,mbakke/ganeti,andir/ganeti,ganeti/ganeti,mbakke/ganeti