Upgrade adds state column to both lease tables, the state table,
and the lease dump functions.

src/bin/admin/scripts/pgsql/upgrade_1.0_to_2.0.sh -
    new script for upgrading postgres schema

src/bin/admin/tests/dhcpdb_create_1.0.pgsql
    new sql script for creating 1.0 schema db

configure.ac
    added entry for new upgrade script

src/bin/admin/kea-admin.in
    pgsql_upgrade() - modified to set Postgres password env variable
    and pass in remaining args as psql expects them

src/bin/admin/scripts/pgsql/Makefile.am
    added entry for new upgrade script

src/bin/admin/tests/Makefile.am
    added entry for 1.0 schema script

src/bin/admin/tests/pgsql_tests.sh.in
    pgsql_upgrade_test()  - revamped now that Postgres actually
    has its first upgrade script.