add libmysqlclient-dev so that XOS API docs can be built

Fail job when errors occur in documentation build

Change-Id: If28222f9c3b38d62256d8242a95ad6923eb2817e
diff --git a/packer/provision/basebuild.sh b/packer/provision/basebuild.sh
index bbceb4d..b37505d 100644
--- a/packer/provision/basebuild.sh
+++ b/packer/provision/basebuild.sh
@@ -60,6 +60,7 @@
         git \
         golang-1.10-go \
         less \
+        libmysqlclient-dev \
         libpcap-dev \
         libxml2-utils \
         maven \