[stable9.1] Fix sharedstorage recursion hell#25789

Merged

PVince81 merged 4 commits intostable9.1from stable9.1-usermountcache-hell-shortcutstorageid

Aug 16, 2016

+146-108

Commits on Aug 15, 2016

Get shared storage numeric id directly from DB
Vincent Petry
committed
Lazy init shared storage by tweaking jail
Vincent Petry
committed
Flag to not recurse into shared mounts in getPath
Vincent Petry
committed
Use FailedStorage when share is invalid
Vincent Petry
committed