Add bootstrap.teamcity.url parameter to specify bootstrap teamcity server

dependencies/kotlin-build-gradle-plugin/src/Bootstrap.kt

@@ -33,6 +33,7 @@ fun Project.kotlinBootstrapFrom(defaultSource: BootstrapOption) {
             teamCityBootstrapVersion,
             kotlinBuildProperties.teamCityBootstrapBuildNumber,
             projectExtId = kotlinBuildProperties.teamCityBootstrapProject,
+            teamcityUrl = kotlinBuildProperties.teamCityBootstrapUrl,
             onlySuccessBootstrap = false
         )
         customBootstrapVersion != null -> BootstrapOption.Custom(

dependencies/kotlin-build-gradle-plugin/src/BuildProperties.kt

@@ -126,6 +126,8 @@ class KotlinBuildProperties(
 
     val teamCityBootstrapProject: String? = get("bootstrap.teamcity.project") as String?
 
+    val teamCityBootstrapUrl: String? = get("bootstrap.teamcity.url") as String?
+
     val rootProjectDir: File = propertiesProvider.rootProjectDir
 }