Use default set of root certificates, if available, when using SSL
Use default set of root certificates, if available, when using SSL

Part of fix for the WebDAV https server authentication problem noticed when
fixing bnc#805901.

Change-Id: Ic54c59bdadaf34cdba32949400d5da69712017f3

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core