Modify sysctl-set-value script to support multi-value parameters

Some kernel parameters require multiple values, such as
net.ipv4.ip_local_port_range 1024 65000
This change allows users to set these valuse with:
sysctl-set-value net.ipv4.ip_local_port_range "1024 65000" "Comment"

Change-Id: Id45df07ab4f2b55cd39f7db9f4b0b60cfea47124
Add a delorean-repo element

This element allows developers to use Yum repositories
generated via the Delorean tool. This is very useful
for testing upstream packages with TripleO element changes.

Change-Id: I290f1adc9631c1350b0cb7ad52b27b6759de05d8
Merge "Add a delorean-repo element"
Merge "Modify sysctl-set-value script to support multi-value parameters"