Parsing One-Off EntryID structure

This structure is meant to represent recipients that do not exist
in the directory.

See [MS-OXCDATA] 2.2.5.1 section for more details.

We are using it for parsing PidTagSenderEntryId property content.
Checking talloc return value for OOM errors

In get_AddressBookEntryId function.
Merge pull request #175 from sixstone-qq/ejhernandez/parse-one-off-entryID

Parsing One-Off EntryID structure