src/lib/dhcpsrv/pgsql_lease_mgr.cc
    Amended commentary for getColumnValue() variants
    Added decription of Uiaid union
    Changed std::system to ::system

src/lib/dhcpsrv/testutils/mysql_schema.cc
    Changed std::system to ::system

src/lib/dhcpsrv/testutils/mysql_schema.h
    Fixed typo

src/lib/dhcpsrv/testutils/pgsql_schema.cc
    Removed extraneous include
    Changed std::system to ::system