If you want to edit your sshd_config file for server-side SSH connection, we should use semanage package manager for SELinux.
Find what package provides semanage:
# yum whatprovides semanage
or
# yum provides /usr/sbin/semanage
Installing semanage on CentOS7:
# yum install policycoreutils-python-utils
Also try:
# yum install policycoreutils-python