Rename the prefix to tokens.

Updade the tests

Author: Thirumalai-Shaktivel

run_tests.py

@@ -79,7 +79,7 @@ def main():
                     filename, update_reference, extra_args)
 
         if tokens:
-            run_test("cpp", "lpython --no-color --show-tokens {infile} -o {outfile}",
+            run_test("tokens", "lpython --no-color --show-tokens {infile} -o {outfile}",
                     filename, update_reference, extra_args)
 
         print()

tests/reference/cpp-complex2-cc31ff8.json

@@ -1,11 +1,11 @@
 {
-    "basename": "cpp-comment1-2f8ab90",
+    "basename": "tokens-comment1-2f8ab90",
     "cmd": "lpython --no-color --show-tokens {infile} -o {outfile}",
     "infile": "tests/tokens/comment1.py",
     "infile_hash": "27258459bf39e8c5bcaa41e7fef8a593775a915273787edc46c73b4d",
     "outfile": null,
     "outfile_hash": null,
-    "stdout": "cpp-comment1-2f8ab90.stdout",
+    "stdout": "tokens-comment1-2f8ab90.stdout",
     "stdout_hash": "39b458b1d715dfd275ef676390dad2e5853cc9b0a7aa9b1c36011a79",
     "stderr": null,
     "stderr_hash": null,

tests/reference/cpp-complex2-cc31ff8.stdout

@@ -1,11 +1,11 @@
 {
-    "basename": "cpp-docstring1-1355fbb",
+    "basename": "tokens-docstring1-1355fbb",
     "cmd": "lpython --no-color --show-tokens {infile} -o {outfile}",
     "infile": "tests/tokens/docstring1.py",
     "infile_hash": "76a733fb41e5cfebb1d9bd74a719fa2644e746ce06a64fbbf91358a8",
     "outfile": null,
     "outfile_hash": null,
-    "stdout": "cpp-docstring1-1355fbb.stdout",
+    "stdout": "tokens-docstring1-1355fbb.stdout",
     "stdout_hash": "8002935592daf4c952a5edb182c847a27e183ec70c3239fd060545f8",
     "stderr": null,
     "stderr_hash": null,

tests/reference/cpp-dictionary1-6564213.json

@@ -1,11 +1,11 @@
 {
-    "basename": "cpp-symbols1-658c990",
+    "basename": "tokens-symbols1-658c990",
     "cmd": "lpython --no-color --show-tokens {infile} -o {outfile}",
     "infile": "tests/tokens/symbols1.py",
     "infile_hash": "4f8b111c9caf59245efae13d9d9efbf2ce5f2c42d0850079e6313903",
     "outfile": null,
     "outfile_hash": null,
-    "stdout": "cpp-symbols1-658c990.stdout",
+    "stdout": "tokens-symbols1-658c990.stdout",
     "stdout_hash": "0c55157185187ddf4454e6129e742698606b70075a4e689d340f770f",
     "stderr": null,
     "stderr_hash": null,