migrate to go modules

Signed-off-by: Valentin Rothberg <rothberg@redhat.com>

vendor/github.com/klauspost/pgzip/.gitignore

@@ -0,0 +1,24 @@
+# Compiled Object files, Static and Dynamic libs (Shared Objects)
+*.o
+*.a
+*.so
+
+# Folders
+_obj
+_test
+
+# Architecture specific extensions/prefixes
+*.[568vq]
+[568vq].out
+
+*.cgo1.go
+*.cgo2.c
+_cgo_defun.c
+_cgo_gotypes.go
+_cgo_export.*
+
+_testmain.go
+
+*.exe
+*.test
+*.prof

vendor/github.com/klauspost/pgzip/.travis.yml

@@ -0,0 +1,21 @@
+language: go
+
+sudo: false
+
+os:
+  - linux
+  - osx
+
+go:
+  - 1.9.x
+  - 1.10.x
+  - master
+
+script: 
+ - go test -v -cpu=1,2,4 .
+ - go test -v -cpu=2 -race -short .
+
+matrix:
+  allow_failures:
+    - go: 'master'
+  fast_finish: true