When SCM-Manager is used behind a reverse proxy like
Nginx it may be the case, that lfs PUT requests are
buffered by the reverse proxy and will be sent to the
SCM-Manager after the whole file has been received. Due
to the expiration time of 5 minutes for the authentivation
token that had been requested by Git before the upload
has been started, this request from the proxy to
SCM-Manager fails if the upload from the client to the
reverse proxy took longer than these 5 minutes.
To solve this, we make this expiration time configurable,
so that whenever you have very large files or small
bandwidth the expiration timeout can be increased.
