Merge branch 'test-regress-be-openssl-v2'

This patchset is a bunch of regression tests for bufferevent openssl layer,
some of them already show some bugs, that bugs will be fixed in the next
patches.

* test-regress-be-openssl-v2:
  test/regress_ssl: check events fd/pending after timeout triggered
  test/regress_ssl: cover case when server didn't up (failed with timeout)
  test/regress_ssl: covert that we can't change fd with underlying
  test/regress_ssl: cover that events (read/write) at finish not pending
  test/regress_ssl: cover fd manipulations
  test/regress_ssl: convert open_ssl_bufevs() to mask
  test/regress_ssl: convert client/server to mask too
  test/regress_ssl: cover "allow_dirty_shutdown"
  test/regress_ssl: convert regress_bufferevent_openssl() to bitmask