[Bug 1559398] [NEW] [2.0a3] Can't commission two many machines at a time

[Andres Rodriguez]

Public bug reported:

Trying to commission 40 machines at a time, I saw a weird issue. The
machines are unable to PXE boot and hence, they can't commission. The
output that's shown in the console log ends with:

CLIENT MAC ADDR: 74 D4 35 89 BC 86  GUID: 86BC8935 D474 8001 E311 EEA180BAF14E
PXE-E53: No boot filename received

PXE-M0F: Exiting Intel Boot Agent.

Basically, it seems that the machine has successfully DHCP'd , but was
unable to get PXE information. This may be related to:

2016-03-19 12:08:15+0800 [ClusterClient,client] RemoteOriginReadSession starting on 52088
2016-03-19 12:08:15+0800 [ClusterClient,client] Starting protocol <tftp.bootstrap.RemoteOriginReadSession object at 0x7fe30c170588>
2016-03-19 12:08:17+0800 [TFTP (UDP)] Datagram received from ('192.168.10.34', 2070): <RRQDatagram(filename=b'pxelinux.0', mode=b'octet', options=OrderedDict([(b'tsize', b'0')]))>
2016-03-19 12:08:17+0800 [-] RemoteOriginReadSession starting on 44086

** Affects: maas (Ubuntu)
     Importance: Undecided
         Status: New

** Description changed:

  Trying to commission 40 machines at a time, I saw a weird issue. The
  machines are unable to PXE boot and hence, they can't commission. The
  output that's shown in the console log ends with:
  
- CLIENT MAC ADDR: 74 D4 35 89 BC 86  GUID: 86BC8935 D474 8001 E311 EEA180BAF14E  
- PXE-E53: No boot filename received                                              
-                                                                                 
+ CLIENT MAC ADDR: 74 D4 35 89 BC 86  GUID: 86BC8935 D474 8001 E311 EEA180BAF14E
+ PXE-E53: No boot filename received
+ 
  PXE-M0F: Exiting Intel Boot Agent.
  
  Basically, it seems that the machine has successfully DHCP'd , but was
- unable to get PXE information.
+ unable to get PXE information. This may be related to:
+ 
+ 2016-03-19 12:08:15+0800 [ClusterClient,client] RemoteOriginReadSession starting on 52088
+ 2016-03-19 12:08:15+0800 [ClusterClient,client] Starting protocol <tftp.bootstrap.RemoteOriginReadSession object at 0x7fe30c170588>
+ 2016-03-19 12:08:17+0800 [TFTP (UDP)] Datagram received from ('192.168.10.34', 2070): <RRQDatagram(filename=b'pxelinux.0', mode=b'octet', options=OrderedDict([(b'tsize', b'0')]))>
+ 2016-03-19 12:08:17+0800 [-] RemoteOriginReadSession starting on 44086

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Title:
  [2.0a3] Can't commission two many machines at a time

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