primary_index_only.7.script.aql

[ASTERIXDB-2171][STO] Remove Temporary Datasets
- user model changes: no
- storage format changes: no
- interface changes: yes
- Removed all reference to temporary datasets.

Details:
- Remove temporary datasets grammar but reserve
<TEMPORARY> token.
- Remove special callbacks for temp datasets.
- Remove metadata garbage collector thread.
- Remove isTemp flag from datasets.
- Remove special storage path for temp datasets.
- Remove temp datasets test cases.

Change-Id: Ib50ea27e2ec9c114508cd4a109cf646e2f20dcb0
Reviewed-on: https://asterix-gerrit.ics.uci.edu/2172
Sonar-Qube: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Integration-Tests: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Tested-by: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Reviewed-by: Michael Blow <mblow@apache.org>