Update running-locally.md sudo example to preserve $PATH

[ostrain]

Tiny change to make the local-up-cluster.sh sudo example preserve $PATH to ensure etcd is available

[k8s-ci-robot]

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[pacoxu]

/ok-to-test

[BenTheElder]

/sig testing
/cc @pohly

[BenTheElder]

this can also break users, imagine if they only have docker available to root (which is why we need to sudo) ... this is dependent on users and their local path manipulation ...

what was missing from PATH in your case?

[ostrain]

etcd was missing -- if one follows the instructions earlier on the page to install etcd, it gets installed in such a way that you have to manually add it to your $PATH