Use #fileID/#filePath instead of #file (#164)

Motivation:

#fileID introduced in Swift 5.3, so no longer need to use #file anywhere

Modifications:

Changed #file to #filePath or #fileID depending on situation

Tests/NIOTransportServicesTests/NIOTSEndToEndTests.swift

@@ -21,7 +21,7 @@ import Network
 
 
 func assertNoThrowWithValue<T>(_ body: @autoclosure () throws -> T, defaultValue: T? = nil, message: String? = nil,
-                               file: StaticString = #file, line: UInt = #line) throws -> T {
+                               file: StaticString = #filePath, line: UInt = #line) throws -> T {
     do {
         return try body()
     } catch {