Weave 1.4.3

Preparing for Docker 1.10, plus some bug-fixes.

• Avoid hang in Docker v1.10 on docker volume ls after weave stop, weave stop-plugin or weave reset #1934/#1936
• Fix "unexpected EOF" from Docker 1.10 on docker exec with Weave proxy --rewrite-inspect enabled #1911/#1917
• Avoid losing DNS entries and potentially double-allocating IP addresses allocated via plugin, on router restart; also extend weave ps to show IP addresses allocated via plugin #1745/#1921
• Stop creating lots of copies of weavewait program in Docker volumes #1757/#1935
• Prevent container starting prematurely when proxy in --no-multicast-route mode #1942/#1943
• Log error message from plugin rather than crashing when weave not running #1906/#1918
• Warn, don't error, if unable to remove plugin network in 'weave stop', to avoid breaking the usual upgrade or config change process #1900/#1919
• Don't crash if network conditions suggest only very small packets will get through #1905/#1926
• Cope with unexpected errors during route traversal when starting container via proxy #1909/#1910/#1932