Summary:
Fixed some option handling code that recently broke the
ASSERT_STATUS_CHECKED build for options_test.

Added all other existing tests that pass under ASSERT_STATUS_CHECKED to
the whitelist.

Added a Travis configuration to run all whitelisted tests with
ASSERT_STATUS_CHECKED. (Someday we might enable this check by default in
debug builds.)
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6870

Test Plan: ASSERT_STATUS_CHECKED=1 make check, Travis

Reviewed By: ajkr

Differential Revision: D21704374

Pulled By: pdillinger

fbshipit-source-id: 15daef98136a19d7a6843fa0c9ec08738c2ac693