Fixes Augeas to Properly Configure Sysctl

The following puppet agent error was observed on nodes:

/Stage[main]/Openshift_origin::Node/Augeas[Tune Sysctl knobs]:
Could not evaluate: missing string argument 2 for set

This prevented Augeas from configuring the necessary sysctl
parameters.
Merge pull request #138 from danehans/sysctl_fix

Fixes Augeas to Properly Configure Sysctl