Upgrade golang versions in base build images

alpine3-go upgrades from 1.13.7 to 1.13.8
ubuntu 18.04 upgrades from 1.12.16 to 1.12.17
   and from 1.13.7 to 1.13.8; adds 1.14

Signed-off-by: Lott, Christopher (cl778h) <cl778h@att.com>
Change-Id: I6d8c58b7d0b48f842fa2160fff18987f4946efcc
diff --git a/docker/bldr-ubuntu18-c-go/Dockerfile b/docker/bldr-ubuntu18-c-go/Dockerfile
index 3d21db2..bcb09e6 100644
--- a/docker/bldr-ubuntu18-c-go/Dockerfile
+++ b/docker/bldr-ubuntu18-c-go/Dockerfile
@@ -47,21 +47,28 @@
 # Install go versions in /opt
 RUN mkdir -p /opt/go
 
-ARG g12="1.12.16"
+ARG g12="1.12.17"
 RUN wget -nv https://dl.google.com/go/go${g12}.linux-amd64.tar.gz \
     && tar -xf go${g12}.linux-amd64.tar.gz \
     && mv go /opt/go/1.12 \
     && rm -f go*.gz
 
-ARG g13="1.13.7"
+ARG g13="1.13.8"
 RUN wget -nv https://dl.google.com/go/go${g13}.linux-amd64.tar.gz \
     && tar -xf go${g13}.linux-amd64.tar.gz \
     && mv go /opt/go/1.13 \
     && rm -f go*.gz
 
+ARG g14="1.14"
+RUN wget -nv https://dl.google.com/go/go${g14}.linux-amd64.tar.gz \
+    && tar -xf go${g14}.linux-amd64.tar.gz \
+    && mv go /opt/go/1.14 \
+    && rm -f go*.gz
+
 ENV GOPATH=/root/go
 # Default path has go version 1.12.x
 # Use /opt/go/1.13/bin for version 1.13.x
+# Use /opt/go/1.14/bin for version 1.14.x
 ENV PATH=$PATH:/opt/go/1.12/bin:$GOPATH/bin
 
 # This installs go-acc to GOPATH