BUG-997 Implement Filesystem source cache for schema repository

Use utility methods for storing files from legacy Filesystem cache

+ Add sorting by Cost to schema repository for multiple providers of the same source

Change-Id: I9a30240042e34fe7898966467b503eee85166887
Signed-off-by: Maros Marsalek <mmarsale@cisco.com>
BUG-997 Fix unused argument in SchemaResolutionException

Change-Id: Id40a5318d824e71405a220c18dffa34ade745c08
Signed-off-by: Maros Marsalek <mmarsale@cisco.com>
Merge "BUG-997 Implement Filesystem source cache for schema repository"
Merge "BUG-997 Fix unused argument in SchemaResolutionException"