Pass Storage Commitment/Verification for objects only external retrievable

[gunterze]

Pass Storage Commitment/Verification for objects only external retrievable, independently of the configured Archive Device Attribute:

Name	Type	Description (LDAP Attribute)
Storage Verification Policy	string	DB_RECORD_EXISTS: only check for existence of DB records, OBJECT_EXISTS: check if object exists on Storage System, OBJECT_SIZE: check size of object on Storage System, OBJECT_FETCH: fetch object from Storage System), OBJECT_CHECKSUM: recalculate checksum of object on Storage System, S3_MD5SUM: check MD5 checksum of object on S3 Storage System. May be overwritten by configured values for particular Archive Network AEs. Enumerated values: - DB_RECORD_EXISTS - OBJECT_EXISTS - OBJECT_SIZE - OBJECT_FETCH - OBJECT_CHECKSUM - S3_MD5SUM (dcmStorageVerificationPolicy)

Effectively behaving like Storage Verification Policy: DB_RECORD_EXISTS, if the object has already been deleted on the cache storage and becomes only external retrievable.

Related: #4251