dcache tape rest API: return ONLINE (or DISK) locality for incomplete…

[DmitryLitvintsev]

… files

Motivation:

CERN FTS won't cleanup files with locality != DISK. StorRM and EOS implementation report locality of these files as DISK

Modification:

Return locality ONLINE if locality is NONE for files w/ zero size

Result:

CERN FTS is happy(ier)

Target: trunk Request: 11.0 Request: 10.2 Request: 10.1 Request: 10.0 Request: 9.2

Patch: https://rb.dcache.org/r/14439/ Acked-by: Tigran