Remove unused certificate fixtures

Author: pimterry

test/fixtures/server.crt

@@ -1,8 +1,3 @@
-import * as fs from 'fs';
-
-export const testKey = fs.readFileSync(__dirname + '/fixtures/server.key');
-export const testCert = fs.readFileSync(__dirname + '/fixtures/server.crt');
-
 export type Deferred<T> = Promise<T> & {
     resolve(value: T): void,
     reject(e: Error): void