sw: clean up using namespace statements in dbmgr
sw: clean up using namespace statements in dbmgr

Change-Id: I5072d8b24384982a445a4a1678d0269601206320

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core