Add experimental GNU Guix package for Python metadata-collect-agent

Currently GNU Guix does not support private git repos, so the
origin is only a placeholder until it works. The package otherwise
does work when supplying the origin from a local or public URL.

guix-pkg.scm

+(use-modules
+ (guix packages)
+ (guix git-download)
+ (guix download)
+ (guix build python-build-system)
+ (guix build-system python) 
+ (guix build utils)
+ (gnu packages python-web)
+ (gnu packages python-xyz)
+ (gnu packages python-crypto)
+ (gnu packages acl))
+
+(define python-pylibacl
+  (package
+  (name "python-pylibacl")
+  (version "0.5.4")
+  (source
+    (origin
+      (method url-fetch)
+      (uri (pypi-uri "pylibacl" version))
+      (sha256
+        (base32
+          "0drvxb21y7p0aikcv3jx90vdcjk96kibf9x8qgxic2prxxd3f3q6"))))
+  (build-system python-build-system)
+  (arguments
+    '(#:tests? #f))
+  (propagated-inputs
+    `(("acl" ,acl)))
+  (home-page "http://pylibacl.k1024.org/")
+  (synopsis "POSIX.1e ACLs for python")
+  (description "POSIX.1e ACLs for python")
+  (license #f)))
+
+(define metadata-collect-agent
+  (package
+    (name "metadata-collect-agent")
+    (version "0.1")
+    (source
+     (origin
+       (method git-fetch)
+       (uri (git-reference
+              (url "https://lab.nexedi.com/nexedi/metadata-collect-agent.git")
+              (commit "v0.1")))
+       (sha256
+        (base32
+         "")))) ;; Fill with "Actual hash" of GNU Guix error
+    (build-system python-build-system)
+    (arguments
+     '(#:tests? #f))
+    (propagated-inputs
+     `(("python-urllib3" ,python-urllib3)
+       ("python-psutil" ,python-psutil)
+       ("python-msgpack" ,python-msgpack)
+       ("python-pylibacl" ,python-pylibacl)
+       ("python-certifi" ,python-certifi)))
+    (description "")
+    (synopsis "")
+    (license #f)
+    (home-page "")))
+
+(packages->manifest
+ (list metadata-collect-agent))