qa/workunits/rados/test_envlibrados_for_rocksdb: use cmake not make

qa/workunits/rados/test_envlibrados_for_rocksdb: use cmake not make

* so we just rely on a single build system instead of two of them, the
  other place we use cmake is cmake/modules/BuildRockDB.cmake.
* disable gflags when building rocksdb, it's optional and does not help
  in the sense of testing librados support.
* disable prompts when installing on debian, to silence warnings like:
  debconf: unable to initialize frontend: Dialog
* drop --force-yes option, as it is deprecated, and is replaced with
  --allow-downgrades, --allow-remove-essential,
  --allow-change-held-packages,  but none of them apply in our case.

Signed-off-by: Kefu Chai <kchai@redhat.com>