dockerfile: Remove a redundant wget in yum install

Remove a redundant wget in yum install

Signed-off-by: ilove737 <[email protected]>

Author: ilove737

dockerfiles/Dockerfile.centos7

@@ -8,7 +8,7 @@ RUN sed -i -e "s/^mirrorlist=http:\/\/mirrorlist.centos.org/#mirrorlist=http:\/\
     sed -i -e "s/^#baseurl=http:\/\/mirror.centos.org/baseurl=http:\/\/vault.centos.org/g" /etc/yum.repos.d/CentOS-Base.repo && \
     yum -y update && \
     yum install -y rpm-build curl ca-certificates gcc gcc-c++ make bash \
-    wget unzip systemd-devel wget flex bison \
+    wget unzip systemd-devel flex bison \
     cyrus-sasl-lib cyrus-sasl-devel openssl openssl-libs openssl-devel libcurl-devel \
     postgresql-libs postgresql-devel postgresql-server postgresql libyaml-devel \
     tar gzip