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
bac0c6fbef