Update git submodules
* Update os-vif from branch 'master' to b0c42708a5d6b9aab8117215219b8aacbe612ff1 - Merge "Use TCP keepalives for ovsdb connections" - Use TCP keepalives for ovsdb connections Ultimately, this is something that should be fixed in python-ovs, but setting the SO_KEEPALIVE socket option benefits the client by removing the need to send 'echo' requests, which can time out on an overloaded ovsdb-server, which causes a disconnection which then# adds even more load on the ovsdb-server as it has to send the entire db contents over the wire after the connection is restored. This patch ports the optimisation form neutron to reduce the likelyhood of a reconnection which can cause the nova compute agent to hang temporarily while the connection is reestablished. Change-Id: I984ec62730276f8ee60d71a02a98fbfc4c37f7d8 Related-Bug: #1930926 Partial-Bug: #1929446
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