Multiple-clause conditions in OVSDB operations with "where" clauses are
supposed to be conjunctions, that is, the condition is true only if every
clause is true. In fact, the implementation only checked a single clause
(not necessarily the first one) and ignored the rest. This fixes the
problem and adds test coverage for multiple-clause conditions.
Reported-by: Shih-Hao Li <shli@nicira.com>
It is natural to write "abc" in place of ["set",["abc"]] and vice versa.
I cannot think of a reason not to support this, and it can make reading
and writing OVSDB files and transactions easier, so support it.
