Connection timeout in sampling causes sample command to hang

[charvolant]

If doing a sample command (or friends), the following exception can appear:

Exception in thread "main" java.net.ConnectException: Connection timed out
    at java.net.PlainSocketImpl.socketConnect(Native Method)
    at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339)
    at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200)
    at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182)
    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
    at java.net.Socket.connect(Socket.java:579)
    at org.apache.http.conn.scheme.PlainSocketFactory.connectSocket(PlainSocketFactory.java:117)
    at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:178)
    at org.apache.http.impl.conn.ManagedClientConnectionImpl.open(ManagedClientConnectionImpl.java:304)
    at org.apache.http.impl.client.DefaultRequestDirector.tryConnect(DefaultRequestDirector.java:610)
    at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:445)
    at org.apache.http.impl.client.AbstractHttpClient.doExecute(AbstractHttpClient.java:863)
    at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:82)
    at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:106)
    at au.org.ala.biocache.util.LayersStore.samplingStatus(LayersStore.scala:155)
    at au.org.ala.biocache.util.LayersStore.sample(LayersStore.scala:51)
    at au.org.ala.biocache.tool.Sampling.processBatchRemote(Sampling.scala:463)
    at au.org.ala.biocache.tool.Sampling.sampling(Sampling.scala:367)
    at au.org.ala.biocache.tool.Sampling$.main(Sampling.scala:114)
    at au.org.ala.biocache.cmd.CMD2$.main(CMD2.scala:134)
    at au.org.ala.biocache.cmd.CMD2.main(CMD2.scala)

At this point, the sample process hangs, neither exiting or recovering.

[charvolant]

Pull request #147