message: Update Dockerfile, resolve
diff: FROM centos:latest
  MAINTAINER left2right <yqzhang@easemob.com>
  -RUN yum -y update && \
  +RUN rpm -ivh https://mirrors.ustc.edu.cn/epel/epel-release-latest-7.noarch.rpm && \
  + yum -y update && \
  yum -y install snappy-devel && \
  yum -y install protobuf-devel && \
  + yum -y install gflags-devel && \
  yum -y install glog-devel && \
  yum -y install gcc-c++ && \
  yum -y install make && \
  @@ -12,7 +14,7 @@ RUN yum -y update && \
  ENV PIKA /pika
  COPY . ${PIKA}
  WORKDIR ${PIKA}
  -RUN make RPATH=${PIKA}/third/glog/.libs
  +RUN make
  ENV PATH ${PIKA}/output/bin:${PATH}
  WORKDIR ${PIKA}/output
  