fix (install.py): compatable centos7

1. use systemctl  stop firewalld
2. add  dependence:  readline-devel and lrzsz
3. use mariadb as mysql server

install/install.py

@@ -128,6 +128,11 @@ class PreSetup(object):
         color_print('开始安装设置mysql (请手动设置mysql安全)', 'green')
         color_print('默认用户名: %s 默认密码: %s' % (self.db_user, self.db_pass), 'green')
         if self._is_redhat:
+            if self._is_centos7:
+                bash('yum -y install mariadb-server mariadb-devel')
+                bash('systemctl enable mariadb.service')
+                bash('systemctl start mariadb.service')
+            else:
                 bash('yum -y install mysql-server')
                 bash('service mysqld start')
                 bash('chkconfig mysqld on')