Add sysbench demo case

demos/sysbench/README.md

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+# Run Linux sysbench
+
+In this demo, we will show how to run the Linux sysbench inside Occlum.
+
+Linux [`sysbench`](https://github.com/akopytov/sysbench) is a scriptable multi-threaded benchmark tool.
+Occlum could also run the `sysbench` for CPU/Threads/Memory/Mutex/... benchmarks.
+
+Please note it is configured with "--without-mysql", so no mysql database benchmark can be done.
+
+## Download and build the Linux sysbench from source code
+```
+./dl_and_build.sh
+```
+
+## Prepare the Occlum instance for sysbench demo
+```
+./prepare_sysbench.sh
+```
+
+## Run the sysbench demo
+
+For example,
+
+* CPU benchmark
+```
+occlum/demos/sysbench/occlum_instance# occlum run /bin/sysbench cpu  --cpu-max-prime=2000 --threads=2 run
+```
+
+* threads benchmark
+```
+# occlum/demos/sysbench/occlum_instance# occlum run /bin/sysbench threads --threads=200 --thread-yields=100 --thread-locks=4 --time=10 run
+```
+
+More test commands could refer to
+```
+# occlum/demos/sysbench/occlum_instance# occlum run /bin/sysbench --help
+```
+
+

demos/sysbench/dl_and_build.sh

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+#! /bin/bash
+set -e
+
+SCRIPT_DIR=$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )
+
+TAG=1.0.20
+SYSBENCH_ISNTALL_DIR=${SCRIPT_DIR}/sysbench-install
+
+rm -rf sysbench-* $TAG.tar.gz*
+wget https://github.com/akopytov/sysbench/archive/refs/tags/$TAG.tar.gz
+tar zxvf $TAG.tar.gz
+
+pushd sysbench-$TAG
+./autogen.sh
+./configure --without-mysql --prefix=${SYSBENCH_ISNTALL_DIR}
+make -j
+make install
+popd
+

demos/sysbench/prepare_sysbench.sh

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+#! /bin/bash
+set -e
+
+rm -rf occlum_instance
+occlum new occlum_instance
+
+cd occlum_instance
+rm -rf image
+copy_bom -f ../sysbench.yaml --root image --include-dir /opt/occlum/etc/template
+
+new_json="$(jq '.resource_limits.user_space_size = "800MB" |
+                .resource_limits.max_num_of_threads = 256 ' Occlum.json)" && \
+    echo "${new_json}" > Occlum.json
+
+occlum build
+#occlum run /bin/sysbench threads --threads=200 --thread-yields=100 --thread-locks=4 --time=10 run

demos/sysbench/sysbench.yaml

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+includes:
+  - base.yaml
+# sysbench
+targets:
+  # copy sysbench
+  - target: /bin
+    copy:
+      - files:
+        - ../sysbench-install/bin/sysbench