apache-spark@1.6: remove

Aliases/apache-spark@2.2

@@ -1 +0,0 @@
-../Formula/apache-spark.rb

Formula/apache-spark@1.6.rb

@@ -1,25 +0,0 @@
-class ApacheSparkAT16 < Formula
-  desc "Engine for large-scale data processing"
-  homepage "https://spark.apache.org"
-  url "https://d3kbcqa49mib13.cloudfront.net/spark-1.6.3-bin-hadoop2.6.tgz"
-  version "1.6.3"
-  sha256 "389e79458ad1d8ad8044643d97304d09bf3ca31f804c386e560033c48123cd69"
-  revision 1
-
-  bottle :unneeded
-
-  keg_only :versioned_formula
-
-  def install
-    # Rename beeline to distinguish it from hive's beeline
-    mv "bin/beeline", "bin/spark-beeline"
-
-    rm_f Dir["bin/*.cmd"]
-    libexec.install Dir["*"]
-    bin.write_exec_script Dir["#{libexec}/bin/*"]
-  end
-
-  test do
-    system "#{bin}/spark-shell <<<'sc.parallelize(1 to 1000).count()'"
-  end
-end