integration : fix TestTLSClientCipherSuitesMismatch in go1.13 #11129
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In go1.13, the TLS13 is enablled by default, and as per go1.13 release notes :
TLS 1.3 cipher suites are not configurable. All supported cipher suites are safe,
and if PreferServerCipherSuites is set in Config the preference order is based
on the available hardware.
Fixing the test case for go1.13 by limiting the TLS version to TLS12
Please read https://github.com/etcd-io/etcd/blob/master/CONTRIBUTING.md#contribution-flow.