fix balancer CSR generation:

Caucase rerequest uses a CSR *template* and use it to generate
a new CSR with a new key, so we should not use the actual key to
generate this CSR, because it is caucase rerequest job to generate
the key.
Also, we should be careful not to generate a new CSR every time this
command run, otherwise a new key will be generated and a new CSR will
be sent to caucase, but caucase will not sign it automatically (since
we configure it to sign only one certificate).

This means that the case of IP address changes is currently not
supported automatically. To support it we would need to:
  - force generation of a new CSR template
  - force caucase rerequester to request a new certificate (by removing
  existing certificate)
  - force caucased to sign the new certificate

This commit also fix indentation and remove simplefile macro that is no longer used