Update create_schema_mssql.cmd

Support for installing a SQL server instance that is on a custom port.  Wrap the first parameter in quotes and provide the custom port number with a comma.  

Sample Input: create_schema_mssql "mymachine,myport" geoportal geoportal geoportalpwd
Merge pull request #99 from pfoppe/sqlconfig_fix

Update create_schema_mssql.cmd. thanks!