Revert "[xsp] FastCGI backend must use new ApplicationServer constructor as well."
Revert "[xsp] FastCGI backend must use new ApplicationServer constructor as well."

This reverts commit 05263bab4fbd6d7390939abc3163fd5d15febeca because the changes break
some apps. More testing is needed.

arthot/xsp,murador/xsp,arthot/xsp,murador/xsp,murador/xsp,arthot/xsp,arthot/xsp,stormleoxia/xsp,stormleoxia/xsp,stormleoxia/xsp,stormleoxia/xsp,murador/xsp