[3967] Addressed review comments

src/bin/admin/scripts/mysql/Makefile.am
    - made use of file list variable

src/bin/admin/scripts/mysql/Makefile.am

@@ -6,7 +6,4 @@ sqlscripts_DATA += upgrade_1.0_to_2.0.sh
 sqlscripts_DATA += upgrade_2.0_to_3.0.sh
 sqlscripts_DATA += upgrade_3.0_to_4.0.sh
 
-EXTRA_DIST = dhcpdb_create.mysql
-EXTRA_DIST += upgrade_1.0_to_2.0.sh
-EXTRA_DIST += upgrade_2.0_to_3.0.sh
-EXTRA_DIST += upgrade_3.0_to_4.0.sh
+EXTRA_DIST = ${sqlscripts_DATA}