prscript: iterate on builds when checking status

This patch is changing the logic when using docker mode. We are
iterating over each builds so we know when one build is over in
the 5 seconds following the event instead of getting the result
when the builds that are checked before are others.

On OISF's build system, the two builds comes out in order so there
is no problem.

qa/prscript.py

@@ -29,6 +29,7 @@ import time
 import argparse
 import sys
 import os
+import copy
 
 GOT_DOCKER = True
 try:
@@ -261,7 +262,26 @@ else:
     sys.exit(0)
 
 res = 0
-for build in buildids:
+if args.docker:
+    while len(buildids):
+        up_buildids = copy.copy(buildids)
+        for build in buildids:
+            ret = GetBuildStatus(build, buildids[build], builder_name = build)
+            if ret == -1:
+                res = -1
+                up_buildids.pop(build, None)
+                print "Build failure for " + build + ": " + BUILDERS_URI + build + '/builds/' + str(buildids[build]) + " (" + ', '.join(up_buildids.keys()) + " remaining)"
+            elif ret == 0:
+                up_buildids.pop(build, None)
+                print "Build successful for " + build + " (" + ', '.join(up_buildids.keys()) + " remaining)"
+        time.sleep(5)
+        buildids = up_buildids
+    if res == -1:
+        sys.exit(-1)
+    else:
+        sys.exit(0)
+else:
+    for build in buildids:
         res = WaitForBuildResult(build, buildids[build], builder_name = build)
 
 if res == 0: