Enable head-based sampling and add some scripts for large scale deployment

This PR is related to the following issues:

• Head based sampling: https://gitlab.mpi-sws.org/cld/tracing/hindsight-grpc/-/issues/17
• Data type of duration: https://gitlab.mpi-sws.org/cld/tracing/hindsight-grpc/-/issues/20
• Docker images and scripts for deployment: https://gitlab.mpi-sws.org/cld/tracing/hindsight-grpc/-/issues/15

Side note, gen_address.py and config/alibaba_parse.py are not used, will be discarded later.

README.md

@@ -140,9 +140,10 @@ in the topology file and match the serv argument given to the hindsigt agent.
   -n, --nocompute            Disables RPC computation, overriding the `exec`
                              value from the topology file.  This makes all RPCs
                              do no computation and return immediately.
-  -p, --otel_port=NUM        Port of the OpenTelemetry collector used to
-                             receive traces from this client. This is required
-                             for ot-jaeger.
+  -h, --otel_host=HOST       Address of the OpenTelemetry collector to send spans.
+                             This is required for ot-jaeger.
+  -p, --otel_port=NUM        Port of the OpenTelemetry collector to send spans.
+                             This is required for ot-jaeger.
   -t, --topology=FILE        A topology file.  This is required.  See
                              config/example_topology.json for an example.
   -x, --tracing=TRACER       Tracing to use, optional.  TRACER can be one of:
@@ -216,6 +217,7 @@ from the topology file to connect to.To run a standalone client, simply run
                              client.  Default 1.
   -t, --topology=FILE        A topology file.  This is required.  See
                              config/example_topology.json for an example.
+  -s, --sampling=NUM         Probability of head-based sampling. Default 1.
   -?, --help                 Give this help list
       --usage                Give a short usage message
 
@@ -293,7 +295,6 @@ completion.  Takes as argument the collector data file
       --usage                Give a short usage message
 ```
 
-
 ### Explanation of topology file
 
 TODO