Refactor symlink filter

This change refactors the use of the symlink filter to make it extendible.
A blocked filter can be set on the Tegra CSV discoverer to ensure that the correct
symlink libraries are filtered out. Here, globs can be used to select mulitple libraries,
and a **/ prefix on the globs indicates that the pattern that follows is only applied to
the filename of the symlink entry in the CSV file.

A --csv.ignore-pattern command line argument is added to the nvidia-ctk cdi generate
command that allows this to be set.

Signed-off-by: Evan Lezar <elezar@nvidia.com>

pkg/nvcdi/lib.go

@@ -47,7 +47,8 @@ type nvcdilib struct {
 	nvidiaCTKPath      string
 	librarySearchPaths []string
 
-	csvFiles []string
+	csvFiles          []string
+	csvIgnorePatterns []string
 
 	vendor string
 	class  string