Simplify cache-redirector script apply method

Now it could be only be applied inside settings file pluginManagement
block. This will update both settings repositories and all projects in
the repo with cache redirection settings.

kotlin-native/build.gradle

@@ -14,15 +14,12 @@
  * limitations under the License.
  */
 
-import kotlin.text.Regex
 import org.jetbrains.kotlin.konan.target.*
 import org.jetbrains.kotlin.konan.util.*
 import org.jetbrains.kotlin.CopySamples
 import org.jetbrains.kotlin.CopyCommonSources
 import org.jetbrains.kotlin.PlatformInfo
 import org.jetbrains.kotlin.KotlinBuildPusher
-import org.jetbrains.kotlin.CollisionDetector
-import org.jetbrains.kotlin.CollisionTransformer
 import org.jetbrains.kotlin.cpp.CompilationDatabasePlugin
 import org.jetbrains.kotlin.CompareDistributionSignatures
 import com.github.jengelman.gradle.plugins.shadow.tasks.ShadowJar
@@ -34,14 +31,8 @@ buildscript {
     apply from: "gradle/kotlinGradlePlugin.gradle"
 
     repositories {
-        if (UtilsKt.getCacheRedirectorEnabled(project)) {
-            maven { url "https://cache-redirector.jetbrains.com/maven-central" }
-            maven { url "https://cache-redirector.jetbrains.com/jcenter" }
-        }
-        else {
-            mavenCentral()
-            jcenter()
-        }
+        mavenCentral()
+        jcenter()
         gradlePluginPortal()
     }
 
@@ -101,10 +92,7 @@ ext {
 allprojects {
     buildscript {
         repositories {
-            if (UtilsKt.getCacheRedirectorEnabled(project))
-                maven { url 'https://cache-redirector.jetbrains.com/jcenter' }
-            else
-                jcenter()
+            jcenter()
         }
     }
     if (path != ":kotlin-native:dependencies") {
@@ -112,10 +100,7 @@ allprojects {
     }
 
     repositories {
-        if (UtilsKt.getCacheRedirectorEnabled(project))
-            maven { url 'https://cache-redirector.jetbrains.com/maven-central' }
-        else
-            mavenCentral()
+        mavenCentral()
         maven {
             url project.bootstrapKotlinRepo
         }