[#853, !26-p] Update schema scripts and tests

[#853, !26-p] Update schema scripts and tests

src/bin/admin/tests/mysql_tests.sh.in
    Updated expected column names
    Added check of column names for 8.0 to 8.2 upgrade

src/share/database/scripts/mysql/dhcpdb_create.mysql
    Changed array column to is_array in dhcp4/6_option_def tables

src/share/database/scripts/mysql/dhcpdb_drop.mysql
    Added missing drops for createOptionAuditDHCP4/6

src/share/database/scripts/mysql/upgrade_6.0_to_7.0.sh.in
    Changed array column to is_array in dhcp4/6_option_def tables

src/share/database/scripts/mysql/upgrade_8.1_to_8.2.sh.in
    Added logic to conditionally change column names