INSTALL: Fix kube-proxy option formatting

[sam-aws]

Issue #, if available:
N/A

Description of changes:
kube-proxy doesn't seem to like the "--option value" format anymore,
but "--option=value" appears to work fine. Update the install section
about conntrack options to match.

Signed-off-by: Samuel Mendoza-Jonas samjonas@amazon.com

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Tested by starting an instance with the following daemonset config:

     - command:
        - kube-proxy
        - --v=2
        - --config=/var/lib/kube-proxy-config/config
        - --conntrack-max-per-core=0
        - --conntrack-min=0

and making sure kube-proxy starts and the node reaches Ready state.