fix(tool/imports): resolve dependency symlinks. (#303)

The change in #302 only removed
symlinks from the directory path for `main.jsonnet`; this commit also
modifies the code that iteratoes through all the transitive dependencies
to de-symlink them.

pkg/jsonnet/imports.go

@@ -56,7 +56,14 @@ func TransitiveImports(dir string) ([]string, error) {
 
 	paths := make([]string, 0, len(imports)+1)
 	for k := range imports {
-		paths = append(paths, k)
+
+		// Try to resolve any symlinks; use the original path as a last resort
+		p, err := filepath.EvalSymlinks(k)
+		if err != nil {
+			return nil, errors.Wrap(err, "resolving symlinks")
+		}
+		paths = append(paths, p)
+
 	}
 	paths = append(paths, mainFile)