(PA-7586) Don't assume curl uses HTTP/1.1

The script assumed curl was using HTTP/1.1 as it was tried to match:

    404 Not Found

When using 2.0, the HTTP status text is not included in the response:

    HTTP/2 404

Update the grep pattern so we handle both 1.1 and 2. If the credentials are
invalid, the task will report:

    21:49:40 -0700 CRIT: ERROR 401
    21:49:40 -0700 CRIT: Unable to retrieve a valid package!

If the requested package doesn't exist, the task will report:

    21:56:33 -0700 CRIT: ERROR 404
    21:56:33 -0700 CRIT: Unable to retrieve a valid package!

Author: joshcooper

tasks/install_shell.sh

@@ -429,14 +429,14 @@ do_curl() {
   rc=$?
 
   # check for 404
-  grep "404 Not Found" $tmp_stderr 2>&1 >/dev/null
+  grep "HTTP/.* 404" $tmp_stderr 2>&1 >/dev/null
   if test $? -eq 0; then
     critical "ERROR 404"
     unable_to_retrieve_package
   fi
 
   # check for 401
-  grep "401 Unauthorized" $tmp_stderr 2>&1 >/dev/null
+  grep "HTTP/.* 401" $tmp_stderr 2>&1 >/dev/null
   if test $? -eq 0; then
     critical "ERROR 401"
     unable_to_retrieve_package