wrap the scheme/authority debuginfo into logs in checkPath method, which...

... validates scheme/authority.  This is a tricky exception to chase down in runtime.  This helps to debug the cryptic 'glusterfs://<myhost>:9000/myfile.txt' but expected 'glusterfs:/// ' error which occurs at runtime when configuration is not correctly set.  This is very useful for debugging ecosystem components whose *-site.xml files arent setup properly.