Update relative paths in start.sh script for MCE installs

[rhmdnd]

This installation script must have been shuffled around from the root of the repository since it contained relative paths to files and directories available from the repository root. Following the directions in the multiclusterengine/ directory results in a failed deploy because the script assumes those relative paths.

This commit updates the script so that it installs cleanly by updating the relative paths.

Closes #242

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[openshift-merge-robot]

@rhmdnd: PR needs rebase.

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