isolate: (refactor) extract blacklisting into common package

client/cmd/isolate/common.go

Index: client/cmd/isolate/common.go
diff --git a/client/cmd/isolate/common.go b/client/cmd/isolate/common.go
index ed01f43a230a4dd1d10cef461f5b40ef19f36b5d..3a5ffdd04731d1abfebc829413c027e9a21eeb0b 100644
--- a/client/cmd/isolate/common.go
+++ b/client/cmd/isolate/common.go
@@ -89,7 +89,7 @@ func (c *isolateFlags) Init(f *flag.FlagSet) {
 	f.StringVar(&c.Isolate, "i", "", "Alias for --isolate")
 	f.StringVar(&c.Isolated, "isolated", "", ".isolated file to generate or read")
 	f.StringVar(&c.Isolated, "s", "", "Alias for --isolated")
-	f.Var(&c.Blacklist, "blacklist", "List of regexp to use as blacklist filter when uploading directories")
+	f.Var(&c.Blacklist, "blacklist", "List of globs to use as blacklist filter when uploading directories")
 	f.Var(&c.ConfigVariables, "config-variable", "Config variables are used to determine which conditions should be matched when loading a .isolate file, default: [].")
 	f.Var(&c.PathVariables, "path-variable", "Path variables are used to replace file paths when loading a .isolate file, default: {}")
 	f.Var(&c.ExtraVariables, "extra-variable", "Extraneous variables are replaced on the command entry and on paths in the .isolate file but are not considered relative paths.")