Support workers number of EC2 service

Beside Nova API & metadata, bring workers management support to EC2
service.

Change-Id: I9617aa971558534eaf84dd3e5e912411918d4497
Signed-off-by: Emilien Macchi <emilien.macchi@enovance.com>
Add quotes for bareword instances of 'type'

In Puppet 3.7.x, 'type' is now a reserved word.  So it must
be quoted to avoid reserved word usage errors.

Closes-Bug: 1370748

Change-Id: I3bb9b0482baebdce549faa1aaf2b0f6073c95e90
Merge "Add quotes for bareword instances of 'type'"