unit-test: Add ability to skip cppcheck

Now you can run openbmc-build-scripts/run-unit-test-docker.sh with
`NO_CPPCHECK=1` to skip cppcheck

We need this mechanizm in case cppcheck hangs. This problem can occur
when compiling with the BOOST_NO_RTTI and BOOST_NO_TYPEID flags.

Tested:
- Run `run-unit-test-docker.sh` as before, verify cppcheck runs
- Run `NO_CPPCHECK=1 run-unit-test-docker.sh`, verify cppcheck is
skipped

Change-Id: Ib1b246dc932b3b36334bfbe51934c206bdeb936f
Signed-off-by: Ewelina Walkusz <ewelinax.walkusz@intel.com>
diff --git a/run-unit-test-docker.sh b/run-unit-test-docker.sh
index 95f0e33..5ac7a67 100755
--- a/run-unit-test-docker.sh
+++ b/run-unit-test-docker.sh
@@ -23,6 +23,7 @@
 #                         `/usr/share/dbus-1/system.conf`
 #   TEST_ONLY:       Optional, do not run analysis tools
 #   NO_FORMAT_CODE:  Optional, do not run format-code.sh
+#   NO_CPPCHECK:     Optional, do not run cppcheck
 #   EXTRA_DOCKER_RUN_ARGS:  Optional, pass arguments to docker run
 #   EXTRA_UNIT_TEST_ARGS:  Optional, pass arguments to unit-test.py
 #   INTERACTIVE: Optional, run a bash shell instead of unit-test.py
@@ -42,6 +43,7 @@
 DBUS_SYS_CONFIG_FILE=${dbus_sys_config_file:-"/usr/share/dbus-1/system.conf"}
 MAKEFLAGS="${MAKEFLAGS:-""}"
 NO_FORMAT_CODE="${NO_FORMAT_CODE:-}"
+NO_CPPCHECK="${NO_CPPCHECK:-}"
 INTERACTIVE="${INTERACTIVE:-}"
 http_proxy=${http_proxy:-}
 
@@ -80,7 +82,8 @@
     UNIT_TEST="/bin/bash"
 else
     UNIT_TEST="${UNIT_TEST_SCRIPT_DIR}/${UNIT_TEST_PY},-w,${DOCKER_WORKDIR},\
--p,${UNIT_TEST_PKG},-b,$BRANCH,-v${TEST_ONLY:+,-t}${NO_FORMAT_CODE:+,-n}\
+-p,${UNIT_TEST_PKG},-b,$BRANCH,\
+-v${TEST_ONLY:+,-t}${NO_FORMAT_CODE:+,-n}${NO_CPPCHECK:+,--no-cppcheck}\
 ${EXTRA_UNIT_TEST_ARGS}"
 fi