tests/manual: trim saved state in coreos-builds-bisect.py

The statefile that tracks the progress of a bisect will today have all
the builds from a given stream in it when really it only needs to keep
track of the range of builds between the known good and known bad
entries. Let's trim it to just that range of builds.

tests/manual/coreos-builds-bisect.py

@@ -76,6 +76,7 @@
 #     cosa kola run --build=$build ext.config.mynewtestiwrote
 
 import argparse
+import copy
 import json
 import os
 import os.path
@@ -146,6 +147,18 @@ def initialize_builds_info(buildsjson, arch, badbuild, goodbuild):
     info[badbuild]['heuristic'] = 'GIVEN'
     info[goodbuild]['status'] = 'GOOD'
     info[goodbuild]['heuristic'] = 'GIVEN'
+
+    # Trim the builds we're operating on in the info dict to just the
+    # range between the bad and good builds
+    in_range = False
+    for key, _ in copy.deepcopy(info).items():
+        if key == badbuild:
+            in_range = True
+        if not in_range:
+            info.pop(key)
+        if key == goodbuild:
+            in_range = False
+
     return info