Fix NPE in gossip integration.go, load tls certificate
Fix NPE in gossip integration.go, load tls certificate

Currently while gossip loads tls certificate there is a null pointer
dereference, this commit takes care to load certificate correctly.

Change-Id: I28833382770053deaac44578ca8abd1abb464ff2
Signed-off-by: Artem Barger <6d127d713cb520aa658cf81ac2373d74ffc1958c@il.ibm.com>

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