Merge branch 'stable-3.1' of git.ispconfig.org:ispconfig/ispconfig3 into stable-3.1

server/plugins-available/apache2_plugin.inc.php

@@ -1236,7 +1236,8 @@ class apache2_plugin {
 				$app->log("Create Let's Encrypt SSL Cert for: $domain", LOGLEVEL_DEBUG);
 				
 				$success = false;
-				$letsencrypt = array_shift( explode("\n", shell_exec('which letsencrypt certbot /root/.local/share/letsencrypt/bin/letsencrypt')) );
+				$letsencrypt = explode("\n", shell_exec('which letsencrypt certbot /root/.local/share/letsencrypt/bin/letsencrypt'));
+				$letsencrypt = reset($letsencrypt);
 				if(is_executable($letsencrypt)) {
 					$success = $this->_exec($letsencrypt . " certonly -n --text --agree-tos --expand --authenticator webroot --server https://acme-v01.api.letsencrypt.org/directory --rsa-key-size 4096 --email postmaster@$domain --domains $lddomain --webroot-path /usr/local/ispconfig/interface/acme");
 				}

server/plugins-available/nginx_plugin.inc.php

@@ -1315,7 +1315,8 @@ class nginx_plugin {
 				$app->log("Create Let's Encrypt SSL Cert for: $domain", LOGLEVEL_DEBUG);
 				
 				$success = false;
-				$letsencrypt = array_shift( explode("\n", shell_exec('which letsencrypt certbot /root/.local/share/letsencrypt/bin/letsencrypt')) );
+				$letsencrypt = explode("\n", shell_exec('which letsencrypt certbot /root/.local/share/letsencrypt/bin/letsencrypt'));
+				$letsencrypt = reset($letsencrypt);
 				if(is_executable($letsencrypt)) {
 					$success = $this->_exec($letsencrypt . " certonly -n --text --agree-tos --expand --authenticator webroot --server https://acme-v01.api.letsencrypt.org/directory --rsa-key-size 4096 --email postmaster@$domain --domains $lddomain --webroot-path /usr/local/ispconfig/interface/acme");
 				}