Update tinc storage cases' ans files

Due to changes of external table "on master" feature
Signed-off-by: NHaozhou Wang <hawang@pivotal.io>

src/test/tinc/tincrepo/mpp/gpdb/tests/storage/basic/exttab/read/sql/query08_dsp.ans

@@ -26,6 +26,7 @@ Format type: text
 Format options: delimiter ',' null '\N' escape '\'
 External options: {}
 External location: file://@hostname@@gpfdist_datadir@/lines?
+Execute on: all segments
 Segment reject limit: 40 rows
 Error Log in File
 

src/test/tinc/tincrepo/mpp/gpdb/tests/storage/basic/exttab/write/sql/functional_dsp.ans

@@ -56,6 +56,7 @@ Format type: text
 Format options: delimiter '|' null '\N' escape '\'
 External options: {}
 External location: gpfdist://@hostname@:@gp_port@/output/wet_ao_dsp.tbl
+Execute on: all segments
 
 INSERT INTO tbl_wet_ao SELECT * FROM ao_table;
 INSERT 0 3

src/test/tinc/tincrepo/mpp/gpdb/tests/storage/basic/exttab/write/sql/functional_dsp.ans.orca

@@ -56,6 +56,7 @@ Encoding: UTF8
 Format type: text
 Format options: delimiter '|' null '\N' escape '\'
 External location: gpfdist://test1:8080/output/wet_ao_dsp.tbl
+Execute on: all segments
 
 INSERT INTO tbl_wet_ao SELECT * FROM ao_table;
 INSERT 0 3