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