Include update alternatives for clang

Also, clean up some of the possible errors in the tidy process to make
sure that things like CD are cleaned up properly.

Tested:
I wish I knew why my docker environment seems to be different than when
jenkins runs it, but alas, this continues to pass on my machine when I
run it against a bmcweb tree with a clang-tidy file in it.

Signed-off-by: Ed Tanous <ed@tanous.net>
Change-Id: Ic88fd9ef3227b21c0d60d2c2d68d21ef15e3bd40
diff --git a/build-unit-test-docker.sh b/build-unit-test-docker.sh
index 6bad754..99fc22e 100755
--- a/build-unit-test-docker.sh
+++ b/build-unit-test-docker.sh
@@ -267,6 +267,13 @@
   --slave /usr/bin/gcov-dump gcov-dump /usr/bin/gcov-dump-10 \
   --slave /usr/bin/gcov-tool gcov-tool /usr/bin/gcov-tool-10
 
+
+RUN update-alternatives --install /usr/bin/clang clang /usr/bin/clang-10 1000 \
+  --slave /usr/bin/clang++ clang++ /usr/bin/clang++-10 \
+  --slave /usr/bin/clang-tidy clang-tidy /usr/bin/clang-tidy-10 \
+  --slave /usr/bin/clang-format clang-format /usr/bin/clang-format-10 \
+  --slave /usr/bin/run-clang-tidy.py run-clang-tidy.py /usr/bin/run-clang-tidy-10.py
+
 RUN pip3 install inflection
 RUN pip3 install pycodestyle
 RUN pip3 install jsonschema