Remove a py34 environment from tox
The gating on python 3.4 is restricted to <= Mitaka. This is due to the change from Ubuntu Trusty to Xenial, where only python3.5 is available. So we can drop py34 environment from tox. Change-Id: I5e4ed5b4e8e90266813c047d6502d2e7f9b7eb59
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