(travis) T::B 1.005 is superseded by 1.300 - remove handholding
(travis) Temporary hard-spec of the SQLA dep, lockstep release
Skip the namespace tests on plain install

Protect users from future spurious changes in uncleaned imports
Move the "special loading" check to DBICTest::Util

No functional changes
is_X_value functions introduced in 3705e3b28 migrated to SQLA