docker: Install systemd-devel for centos7 build

```
error: Failed build dependencies:
	systemd-devel is needed by frr-8.3_git275938094422-01.el7.x86_64
```

Signed-off-by: Donatas Abraitis <donatas@opensourcerouting.org>

diff --git a/docker/centos-7/Dockerfile b/docker/centos-7/Dockerfile
index 99a3b8c9c634dcf8eb5e6e3d790fa2ce984d9fe2..2d1ee9efa49887f217e6b24354a19868f26a46ed 100644 (file)
--- a/docker/centos-7/Dockerfile
+++ b/docker/centos-7/Dockerfile
@@ -4,7 +4,7 @@ RUN yum install -y epel-release
 RUN yum install -y rpm-build autoconf automake libtool make \
         readline-devel texinfo net-snmp-devel groff pkgconfig \
         json-c-devel pam-devel bison flex pytest c-ares-devel \
-        python3-devel python3-sphinx libcap-devel \
+        python3-devel python3-sphinx libcap-devel systemd-devel \
         https://ci1.netdef.org/artifact/LIBYANG-LIBYANGV2/shared/build-2/CentOS-7-x86_64-Packages/libyang2-2.0.0.10.g2eb910e4-1.el7.x86_64.rpm \
         https://ci1.netdef.org/artifact/LIBYANG-LIBYANGV2/shared/build-2/CentOS-7-x86_64-Packages/libyang2-devel-2.0.0.10.g2eb910e4-1.el7.x86_64.rpm \
         https://ci1.netdef.org/artifact/RPKI-RTRLIB/shared/build-00146/CentOS-7-x86_64-Packages/librtr-0.8.0-1.el7.x86_64.rpm \