OPENDJ-1602 (CR-5566) New pluggable storage based backend

Simplified code.


+-----+
| JEB |
+-----+

SortValuesSet.java:
Added add(SortValues), changed remove(long, ByteString[]) into remove(SortValues).

jeb.VLVIndex.java:
Used SortValuesSet new methods.

TestVerifyJob.java:
Adapted the code to SortValuesSet.remove() new signature.


+-----------+
| Pluggable |
+-----------+

Did the same changes as in JEB.


EntryContainer.java:
Used EntryID.toByteString() instead of the less efficient ByteString.valueOf(EntryID.longValue()).
Removed calls to EntryId.longValue() in logging calls.

JebFormat.java:
Removed entryIDToDatabase(), replaced by calls to EntryID.toByteString().

SuffixContainer.java:
Removed unused imports.

VerifyJob.java:
Used vlvIndex.encodeKey(SortValues).
Fixed formatting.

VLVIndex.java:
Changed encodeKey() visibility to package private.