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ARROW-14696: [Java] Reset vectors before populating JDBC data when reusing vector schema root

When the option of reusing vector schema root, the vectors should be reset before populating data from JDBC.
This may cause problems when there are null values in the previous batch.

For details, please see https://github.com/apache/arrow/issues/11589.

Closes #11693 from liyafan82/fly_1112_jb

Authored-by: liyafan82 <fan_li_ya@foxmail.com>
Signed-off-by: Krisztián Szűcs <szucs.krisztian@gmail.com>