add spaces, leading underscore to oracle checks

add spaces, leading underscore to oracle checks

Expand the test suite from #8708 which unfortunately did
not exercise the bound parameter codepaths completely.

Continued fixes for Oracle fix :ticket:`8708` released in 1.4.43 where
bound parameter names that start with underscores, which are disallowed by
Oracle, were still not being properly escaped in all circumstances.

Fixes: #8708
Change-Id: Ic389c09bd7c53b773e5de35f1a18ef20769b92a7