[ASTERIXDB-2305][FUN] replace() should not accept regular expressions

- user model changes: yes
- storage format changes: no
- interface changes: no

Details:
- replace() function was equivalent to regexp_replace(),
  both were based on regular expressions
- this change makes replace() function operate on plain strings
- regexp_replace() continues to operate on regular expressions

Change-Id: Ic01db334c2ef0cab5834cc161ee4f212cf2cb105
Reviewed-on: https://asterix-gerrit.ics.uci.edu/2440
Reviewed-by: Till Westmann <tillw@apache.org>
Tested-by: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Contrib: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Integration-Tests: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
diff --git a/asterixdb/asterix-app/src/test/resources/runtimets/testsuite_sqlpp.xml b/asterixdb/asterix-app/src/test/resources/runtimets/testsuite_sqlpp.xml
index 6bb1886..7d064a5 100644
--- a/asterixdb/asterix-app/src/test/resources/runtimets/testsuite_sqlpp.xml
+++ b/asterixdb/asterix-app/src/test/resources/runtimets/testsuite_sqlpp.xml
@@ -6201,33 +6201,18 @@
       </compilation-unit>
     </test-case>
     <test-case FilePath="string">
+      <compilation-unit name="replace">
+        <output-dir compare="Text">replace</output-dir>
+      </compilation-unit>
+    </test-case>
+    <test-case FilePath="string">
+      <compilation-unit name="replace_with_limit">
+        <output-dir compare="Text">replace_with_limit</output-dir>
+      </compilation-unit>
+    </test-case>
+    <test-case FilePath="string">
       <compilation-unit name="regexp_replace">
-        <output-dir compare="Text">replace22</output-dir>
-      </compilation-unit>
-    </test-case>
-    <test-case FilePath="string">
-      <compilation-unit name="replace1">
-        <output-dir compare="Text">replace1</output-dir>
-      </compilation-unit>
-    </test-case>
-    <test-case FilePath="string">
-      <compilation-unit name="replace2">
-        <output-dir compare="Text">replace2</output-dir>
-      </compilation-unit>
-    </test-case>
-    <test-case FilePath="string">
-      <compilation-unit name="replace21">
-        <output-dir compare="Text">replace21</output-dir>
-      </compilation-unit>
-    </test-case>
-    <test-case FilePath="string">
-      <compilation-unit name="replace22">
-        <output-dir compare="Text">replace22</output-dir>
-      </compilation-unit>
-    </test-case>
-    <test-case FilePath="string">
-      <compilation-unit name="replace3">
-        <output-dir compare="Text">replace3</output-dir>
+        <output-dir compare="Text">regexp_replace</output-dir>
       </compilation-unit>
     </test-case>
     <test-case FilePath="string">