refactor more if statements

	change egrep -i "string" filename to cat filename piped to grep -q "string"

On branch centos7
Changes to be committed:

	modified:   scripts/aliases.sh
	modified:   scripts/firewalld.sh
	modified:   scripts/lemp.sh
	modified:   scripts/nginx_config.sh
	modified:   scripts/server_ssh.sh
	modified:   scripts/swap.sh
	modified:   scripts/wordpress_install.sh
	modified:   scripts/workstation_ssh.sh