[python] handle DisableOpenSSLInitialization() result status
[python] handle DisableOpenSSLInitialization() result status

This patch adds verification for DisableOpenSSLInitialization().

The motivation for this change is two-fold:
  a) avoid glitches while initializing the OpenSSL library
     by python Kudu client if DisableOpenSSLInitialization()
     de facto failed
  b) get rid of compilation warnings on unhandled return value
     of the DisableOpenSSLInitialization() function

Change-Id: I1963b6d87d731fbfa87a09b986595aa8ea00da60
Reviewed-on: http://gerrit.cloudera.org:8080/12135
Tested-by: Alexey Serbin <864f6b82bd94e8dda64141d4274519ee66e0102e@cloudera.com>
Reviewed-by: Adar Dembo <866ca730bfc7f544e3ebce604ceeba4879f23df0@cloudera.com>

InspurUSA/kudu,InspurUSA/kudu,InspurUSA/kudu,InspurUSA/kudu,helifu/kudu,helifu/kudu,helifu/kudu,helifu/kudu,InspurUSA/kudu,helifu/kudu,helifu/kudu,InspurUSA/kudu,helifu/kudu,helifu/kudu,InspurUSA/kudu,InspurUSA/kudu,InspurUSA/kudu,helifu/kudu