[3916] Use stored procedures for MySQL lease dumps

src/bin/admin/kea-admin.in
    src/bin/admin/kea-admin.in
        get_dump_query() - modified SQL text returned for MySQL backend
        which calls stored procedures to produce lease dumps  rather than
        SQL text from lease_dump_<version>.sh

src/bin/admin/scripts/mysql/Makefile.am
    removed entries for leave_dump_<version>.sh files

src/bin/admin/scripts/mysql/dhcpdb_create.mysql
    Added sql to create stored procedures for lease dumps:
        lease4DumpHeader
        lease4DumpData
        lease6DumpHeader
        lease6DumpData

src/bin/admin/scripts/pgsql/dhcpdb_create.pgsql
    Changes table references in lease6DumpData() to match
    convention used in MySQL lease6DumpData()

src/bin/admin/tests/mysql_tests.sh.in
    mysql_lease4_dump_test() - change lease4 test leases to have differing
    values for lease4.state

    mysql_lease6_dump_test() - change lease4 test leases to have differing
    values for lease6.state

mysql.lease4_dump_test.reference.csv
mysql.lease6_dump_test.reference.csv
    Changed reference files to use lease_state.name values rather than
    lease.state to match dump query output and  new test data

src/bin/admin/scripts/mysql
    deleted the following files as they are now obsolete
        leave_dump_1.0.sh
        leave_dump_2.0.sh
        leave_dump_3.0.sh
        leave_dump_4.0.sh
    Makefile.am - removed entries for deleted lease dump scripts

src/bin/admin/scripts/pgsql/dhcpdb_create.pgsql

@@ -164,19 +164,19 @@ CREATE FUNCTION lease6DumpData() RETURNS
            fqdn_rev int,
            hostname text
     ) AS $$
-    SELECT (a.address,
-            encode(a.duid,'hex'),
-            a.valid_lifetime,
-            a.expire,
-            a.subnet_id,
-            a.pref_lifetime,
-            b.name,
-            a.iaid,
-            a.prefix_len,
-            a.fqdn_fwd::int,
-            a.fqdn_rev::int,
-            a.hostname)
-     FROM lease6 a left outer join lease6_types b on (a.lease_type = b.lease_type);
+    SELECT (l.address,
+            encode(l.duid,'hex'),
+            l.valid_lifetime,
+            l.expire,
+            l.subnet_id,
+            l.pref_lifetime,
+            t.name,
+            l.iaid,
+            l.prefix_len,
+            l.fqdn_fwd::int,
+            l.fqdn_rev::int,
+            l.hostname)
+     FROM lease6 l left outer join lease6_types t on (l.lease_type = t.lease_type);
 $$ LANGUAGE SQL;
 --