keep connection between booster-bitswap and proxy alive

[dirkmc]

Fixes #865

Sample output:

2022-10-04T18:01:43.849+0300    INFO    booster booster-bitswap/run.go:106      Starting booster-bitswap node on port 24006
2022-10-04T18:01:43.849+0300    INFO    booster booster-bitswap/server.go:43    connecting to proxy     {"proxy": "{12D3KooWE8yt84RVwW3sFcd6WMjbUdWrZer2YtT4dmtj3dHdahSZ: [/ip4/85.11.148.122/tcp/24001]}"}
2022-10-04T18:01:43.855+0300    INFO    booster booster-bitswap/server.go:72    bitswap server running  {"multiaddrs": ["/ip4/192.168.0.109/tcp/24006","/ip4/127.0.0.1/tcp/24006","/ip4/192.168.0.109/udp/24006/quic","/ip4/127.0.0.1/udp/24006/quic"], "peerId": "12D3KooWGk5Q7vHfemk5iu8a9e3W6b5xPLVEw85KGMcX2EDhMjo9"}
2022-10-04T18:03:53.858+0300    WARN    booster booster-bitswap/server.go:96    failed to connect to proxy      {"address": "{12D3KooWE8yt84RVwW3sFcd6WMjbUdWrZer2YtT4dmtj3dHdahSZ: [/ip4/85.11.148.122/tcp/24001]}"}
2022-10-04T18:03:58.856+0300    WARN    booster booster-bitswap/server.go:96    failed to connect to proxy      {"address": "{12D3KooWE8yt84RVwW3sFcd6WMjbUdWrZer2YtT4dmtj3dHdahSZ: [/ip4/85.11.148.122/tcp/24001]}"}
2022-10-04T18:04:03.860+0300    INFO    booster booster-bitswap/server.go:98    reconnected to proxy    {"address": "{12D3KooWE8yt84RVwW3sFcd6WMjbUdWrZer2YtT4dmtj3dHdahSZ: [/ip4/85.11.148.122/tcp/24001]}"}