zhouya 27fb288f11 fix bug of read from conf file is str instead of flag
1.fix bug of get config from conf file is a str
2.modify daisy default backend as kolla
3.modify daisy max os install num to 20

Change-Id: I9ebb0e9ec4ff100ec723544d10a15aebe78585f2
2017-04-28 15:10:19 +08:00
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