Merge: + client: handle client block and unblock from the top clients table

Closes #896

Squashed commit of the following:

commit 776de2ae0a62823b8968cff79a9fa7ba350d7f1c
Author: Ildar Kamalov <i.kamalov@adguard.com>
Date:   Thu Jan 30 11:13:41 2020 +0300

    - client: fix normalizeTextarea and blocking button

commit 399e6bc3893093632b09247eaf6493521a668c84
Author: Ildar Kamalov <i.kamalov@adguard.com>
Date:   Wed Jan 29 17:19:50 2020 +0300

    + client: handle client block and unblock from the top clients table

client/src/helpers/constants.js

@@ -456,3 +456,8 @@ export const DETAILED_DATE_FORMAT_OPTIONS = {
 };
 
 export const CUSTOM_FILTERING_RULES_ID = 0;
+
+export const ACTION = {
+    block: 'block',
+    unblock: 'unblock',
+};

client/src/helpers/helpers.js

@@ -122,6 +122,17 @@ export const addClientInfo = (data, clients, param) => (
     })
 );
 
+export const addClientStatus = (data, disallowedClients, param) => (
+    data.map((row) => {
+        const clientIp = row[param];
+        const blocked = !!(disallowedClients && disallowedClients.includes(clientIp));
+        return {
+            ...row,
+            blocked,
+        };
+    })
+);
+
 export const normalizeFilteringStatus = (filteringStatus) => {
     const {
         enabled, filters, user_rules: userRules, interval,
@@ -275,7 +286,13 @@ export const redirectToCurrentProtocol = (values, httpPort = 80) => {
     }
 };
 
-export const normalizeTextarea = text => text && text.replace(/[;, ]/g, '\n').split('\n').filter(n => n);
+export const normalizeTextarea = (text) => {
+    if (!text) {
+        return [];
+    }
+
+    return text.replace(/[;, ]/g, '\n').split('\n').filter(n => n);
+};
 
 /**
  * Normalizes the topClients array