[secStore] Allow tool to write value from stdin
[secStore] Allow tool to write value from stdin

Just slightly more conveniant.

Resolves: LE-8882
Change-Id: I43b7e9ce79c5ab8d70d4084d729ed9d29f4fded8

legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af