HADOOP-17056. shelldoc fails in hadoop-common. (#2045)

In the docker build image, skip GPG verification when downloading
Yetus tarball via yetus-wrapper.

dev-support/bin/yetus-wrapper

@@ -144,7 +144,7 @@ else
   exit 1
 fi
 
-if [[ -n "${GPGBIN}" ]]; then
+if [[ -n "${GPGBIN}" && ! "${HADOOP_SKIP_YETUS_VERIFICATION}" = true ]]; then
   if ! mkdir -p .gpg; then
     yetus_error "ERROR: yetus-dl: Unable to create ${HADOOP_PATCHPROCESS}/.gpg"
     exit 1

dev-support/docker/Dockerfile

@@ -183,6 +183,9 @@ RUN curl -L -s -S \
 ###
 ENV MAVEN_OPTS -Xms256m -Xmx1536m
 
+# Skip gpg verification when downlonading Yetus via yetus-wrapper
+ENV HADOOP_SKIP_YETUS_VERIFICATION true
+
 ###
 # Everything past this point is either not needed for testing or breaks Yetus.
 # So tell Yetus not to read the rest of the file:

dev-support/docker/Dockerfile_aarch64

@@ -218,6 +218,9 @@ RUN mkdir -p /opt/phantomjs \
 ###
 ENV MAVEN_OPTS -Xms256m -Xmx1536m
 
+# Skip gpg verification when downlonading Yetus via yetus-wrapper
+ENV HADOOP_SKIP_YETUS_VERIFICATION true
+
 ###
 # Everything past this point is either not needed for testing or breaks Yetus.
 # So tell Yetus not to read the rest of the file: