Merge branch 'devel-2.5'

* devel-2.5:
  rpc: Disable HTTP client pool and reduce memory consumption
  Preserve bridge MTU in KVM ifup script
  hail: Fix result for node evacuation
  Fix assertion error on unclean master shutdown

Signed-off-by: Michael Hanselmann <hansmi@google.com>
Reviewed-by: Iustin Pop <iustin@google.com>