rename stmt_option_scrollable to driver specific names

[yukiwongky]

Rename stmt_opton_scrollable to driver specific names (stmt_option_ss_scrollable and stmt_option_pdo_scrollable)P
ut get_eror_message into namespace (util.cpp and pdo_util.cpp)

[coveralls]

Coverage decreased (-29.08%) to 26.296% when pulling 06a343f on v-kaywon:driverorder into 7434d06 on Microsoft:dev.

[coveralls]

Coverage remained the same at 55.372% when pulling ccd80a3 on v-kaywon:driverorder into 7434d06 on Microsoft:dev.

[coveralls]

Coverage increased (+0.06%) to 55.429% when pulling 4057a92 on v-kaywon:driverorder into 7434d06 on Microsoft:dev.

[coveralls]

Coverage increased (+0.06%) to 55.429% when pulling 4057a92 on v-kaywon:driverorder into 7434d06 on Microsoft:dev.