add segment test=develop

tools/Dockerfile.devel

 FROM centos:7.3.1611
-RUN yum -y install wget >/dev/null \
+RUN yum -y install wget  \
     && yum -y install gcc gcc-c++ make glibc-static which >/dev/null \
     && yum -y install git openssl-devel curl-devel bzip2-devel python-devel
 
@@ -16,7 +16,7 @@ RUN wget https://dl.google.com/go/go1.14.linux-amd64.tar.gz >/dev/null \
     && echo 'export PATH=/usr/local/go/bin:$PATH' >> /root/.bashrc \
     && rm go1.14.linux-amd64.tar.gz 
 
-RUN yum -y install python-devel sqlite-devel >/dev/null \
+RUN yum -y install python-devel sqlite-devel  \
     && curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py >/dev/null \
     && python get-pip.py >/dev/null \
     && pip install google protobuf setuptools wheel flask >/dev/null \

tools/Dockerfile.gpu.devel

 FROM nvidia/cuda:9.0-cudnn7-devel-centos7
 RUN yum -y install wget >/dev/null \
-    && yum -y install gcc gcc-c++ make glibc-static which >/dev/null \
+    && yum -y install gcc gcc-c++ make glibc-static which  \
     && yum -y install git openssl-devel curl-devel bzip2-devel python-devel
 
 RUN wget https://cmake.org/files/v3.2/cmake-3.2.0-Linux-x86_64.tar.gz >/dev/null \
@@ -16,7 +16,7 @@ RUN wget https://dl.google.com/go/go1.14.linux-amd64.tar.gz >/dev/null \
     && echo 'export PATH=/usr/local/go/bin:$PATH' >> /root/.bashrc \
     && rm go1.14.linux-amd64.tar.gz 
 
-RUN yum -y install python-devel sqlite-devel >/dev/null \
+RUN yum -y install python-devel sqlite-devel  \
     && curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py >/dev/null \
     && python get-pip.py >/dev/null \
     && pip install google protobuf setuptools wheel flask >/dev/null \