Added warning for wildcarded IMPORT CLASS statements and error for exact
match IMPORT CLASS statements.
Fixed problem with problem with compiling multiple DDL files and now
generate errors or warnings for missing class files or wildcarded
classpaths respectively.
LicenseCheck whitespace issues
Incorporated comments from John.
Merge pull request #1216 from VoltDB/ENG-5886-NoErrorForMissingImportClass

Eng 5886 no error for missing import class