Add cache for getStorage and getInternalPath functions.
Add cache for getStorage and getInternalPath functions.

These are called for almost every file operation.

owncloud/core,nextcloud/server,lrytz/core,bluelml/core,nextcloud/server,andreas-p/nextcloud-server,xx621998xx/server,whitekiba/server,jbicha/server,pollopolea/core,xx621998xx/server,pmattern/server,jbicha/server,bluelml/core,owncloud/core,pixelipo/server,endsguy/server,lrytz/core,michaelletzgus/nextcloud-server,cernbox/core,IljaN/core,pixelipo/server,cernbox/core,pixelipo/server,lrytz/core,sharidas/core,pixelipo/server,endsguy/server,phil-davis/core,pollopolea/core,xx621998xx/server,owncloud/core,pollopolea/core,andreas-p/nextcloud-server,Ardinis/server,cernbox/core,pmattern/server,xx621998xx/server,sharidas/core,jbicha/server,pmattern/server,sharidas/core,owncloud/core,sharidas/core,xx621998xx/server,pmattern/server,whitekiba/server,lrytz/core,lrytz/core,bluelml/core,endsguy/server,michaelletzgus/nextcloud-server,michaelletzgus/nextcloud-server,pollopolea/core,Ardinis/server,andreas-p/nextcloud-server,pollopolea/core,whitekiba/server,whitekiba/server,jbicha/server,IljaN/core,endsguy/server,pmattern/server,IljaN/core,andreas-p/nextcloud-server,Ardinis/server,Ardinis/server,cernbox/core,nextcloud/server,IljaN/core,jbicha/server,sharidas/core,Ardinis/server,nextcloud/server,andreas-p/nextcloud-server,bluelml/core,bluelml/core,owncloud/core,michaelletzgus/nextcloud-server,cernbox/core,IljaN/core,pixelipo/server,endsguy/server,whitekiba/server