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696.1

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jenkins

Enrico Olivelli 
[bookie-server] add support of client auto cert refresh

### Motivation
as described at: https://github.com/apache/pulsar/issues/6010

Bookkeeper-client caches the tls certificates when it first tries to create a cnx with a given bookie and after that it never reloads certs even when valid certs changes on the file-system or new bookie-connection is created. Because of that as soon as client certs expires and bk-client disconnects from bookie then bk-client is not able to reconnect to bookie until we restart the bk-client process. and we see below TLS exception at bk-client.

```
19:43:03.983 [bookkeeper-io-12-45] ERROR org.apache.bookkeeper.proto.PerChannelBookieClient - Unexpected exception caught by bookie client channel handler
io.netty.handler.codec.DecoderException: javax.net.ssl.SSLHandshakeException: General OpenSslEngine problem
        at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:472) ~[netty-codec-4.1.31.Final.jar:4.1.31.Final]
        at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:278) ~[netty-codec-4.1.31.Final.jar:4.1.31.Final]
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362) [netty-all-4.1.32.Final.jar:4.1.32.Final]
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348) [netty-all-4.1.32.Final.jar:4.1.32.Final]
        at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340) [netty-all-4.1.32.Final.jar:4.1.32.Final]
        at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1434) [netty-all-4.1.32.Final.jar:4.1.32.Final]
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362) [netty-all-4.1.32.Final.jar:4.1.32.Final]
        at io.netty.channel.AbstractChannelHandlerCont... (continued)

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Source Files on job 696.1