[Merge] lp:~lutostag/ubuntu/trusty/maas/1.5.4 into lp:ubuntu/trusty-proposed/maas

[Greg Lutostanski]

For an SRU team member who may be looking at this, effected bugs fixed in SRU are:
1350235
1338851
1337437
1190986
1325759
1325640
1315154
1352273
1342302
1334401
1331982
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https://code.launchpad.net/~lutostag/ubuntu/trusty/maas/1.5.4/+merge/232757
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