Simplify xpath test, to not use gpfdist, and move out of bugbuster.

I don't see any reason to expect that this would behave differently with
an external table than a normal one.

Move the test from bugbuster to the normal regression suite.

src/test/regress/bugbuster/known_good_schedule

@@ -2,7 +2,7 @@
 ## TODO: list test sequence and test dependencies.
 ##
 ignore: jdbc
-test: load_mpph xpath
+test: load_mpph
 # these tests depend on load_mpph
 test: mpph_query mpph_aopart hashagg gpsort
 test: mpp-11333

src/test/regress/bugbuster/expected/xpath.out → src/test/regress/expected/xpath.out

 set xmloption='document';
 set optimizer_disable_missing_stats_collection = on;
-\! gpfdist -p 45555 -d bugbuster/data &> bugbuster/data/xpath_gpfdist.out &
--- apparently this is needed on darwin
-\! sleep 5
-\echo --start_ignore
 --start_ignore
-drop external table if exists readxml;
+drop table table if exists readxml;
 NOTICE:  table "readxml" does not exist, skipping
-\echo --end_ignore
 --end_ignore
-create readable external table readxml (text xml) location ('gpfdist://localhost:45555/CD.xml') format 'TEXT' (escape 'off' newline as 'CRLF');
+create table readxml (text xml);
+\copy readxml from 'data/CD.xml' with escape 'off' newline as 'CRLF';
 select xml_in('<a></a>');
  xml_in  
 ---------
@@ -761,4 +757,3 @@ select xml_is_well_formed_content('<adf>adsfasdf');
  f
 (1 row)
 
-\! ps -ef | grep "gpfdist -p 45555" | grep -v grep | awk '{print $2}' | xargs kill &> bugbuster/data/xpath_kill_gpfdist.out

src/test/regress/greenplum_schedule

@@ -16,7 +16,7 @@
 #
 
 test: variadic_parameters default_parameters function_extensions
-test: spi
+test: spi xpath
 
 test: leastsquares opr_sanity_gp decode_expr bitmapscan bitmapscan_ao case_gp limit_gp notin percentile naivebayes join_gp union_gp gpcopy gp_create_table
 test: filter gpctas gpdist matrix toast sublink table_functions olap_setup complex opclass_ddl information_schema guc_env_var

src/test/regress/bugbuster/sql/xpath.sql → src/test/regress/sql/xpath.sql

 set xmloption='document';
 set optimizer_disable_missing_stats_collection = on;
-\! gpfdist -p 45555 -d bugbuster/data &> bugbuster/data/xpath_gpfdist.out &
--- apparently this is needed on darwin
-\! sleep 5
 
-\echo --start_ignore
-drop external table if exists readxml;
-\echo --end_ignore
+--start_ignore
+drop table if exists readxml;
+--end_ignore
 
-create readable external table readxml (text xml) location ('gpfdist://localhost:45555/CD.xml') format 'TEXT' (escape 'off' newline as 'CRLF');
+create table readxml (text xml);
 
+\copy readxml from 'data/CD.xml' with escape 'off' newline as 'CRLF';
 
 select xml_in('<a></a>');
 select xml_in('<a></>');
@@ -99,6 +97,3 @@ select xml_is_well_formed_content(text((select * from readxml)));
 
 select xml_is_well_formed_content('<adf>adsfasdf<adf>');
 select xml_is_well_formed_content('<adf>adsfasdf');
-
-\! ps -ef | grep "gpfdist -p 45555" | grep -v grep | awk '{print $2}' | xargs kill &> bugbuster/data/xpath_kill_gpfdist.out
-