Remove old excludes
These are detected as errors since the clean up was done[1] in
the requirements repository. Minimum versions are bumped to avoid
installing known bad versions.
[1] 314734e938f107cbd5ebcc7af4d9167c11347406
Also remove the note about old pip's behavior because resolver in
recent pip does not require specific order.
Change-Id: I2606a494c60342b9849f8c837602dc81d28a5f95
diff --git a/requirements.txt b/requirements.txt
index 108bbee..ae5ea16 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,8 +1,4 @@
-# The order of packages is significant, because pip processes them in the order
-# of appearance. Changing the order has an impact on the overall integration
-# process, which may cause wedges in the gate later.
-
-pbr!=2.1.0,>=2.0.0 # Apache-2.0
+pbr>=3.0.0 # Apache-2.0
ddt>=1.6.0 # MIT
oslo.log>=3.36.0 # Apache-2.0