Customer reported that they need to add escaped quotes around the "-databaseType" parameter definition. This is because websphere expects that stings like "SQL Server" contain a space. Without the space in the string they can't specify that database type as the "dbtype" parameter in the websphere_jdbc_provider class.
Some of the other parameters in the params_string definition already contain escaped quotes, so mirroring those examples appears to work.
This document refers to valid values for databaseType: https://www.ibm.com/support/knowledgecenter/en/SSAW57_8.0.0/com.ibm.websphere.nd.doc/info/ae/ae/rxml_7adminjdbc.html