gnu: Remove MongoDB.

mongodb 3.4.10 has unpatched CVEs and mongodb 3.4.24 has some files in the
release tarball under the SSPL, therefore we cannot provide mongodb while
upholding to good security standards.

It turns out feff80cec3 was right since while
the main license file wasnt altered to SSPL, some files in the tree contain
SSPL headers.

* gnu/packages/databases.scm (go-gopkg.in-mgo.v2): Remove.
* gnu/packages/databases.scm (mongo-tools): Remove.
* doc/guix.texi (mongodb-service-type): Remove.
* gnu/tests/databases.scm (%test-mongodb, %mongodb-os, run-mongodb-test):
Remove.
* gnu/services/databases.scm (mongodb-configuration, mongodb-configuration?,
mongodb-configuration-mongodb, mongodb-configuration-config-file,
mongodb-configuration-data-directory, mongodb-service-type,
%default-mongodb-configuration-file, %mongodb-accounts, mongodb-activation,
mongodb-shepherd-service): Remove.
* gnu/packages/databases.scm (mongodb): Remove.

gnu/services/databases.scm

@@ -79,13 +79,6 @@
             memcached-configuration-udp-port
             memcached-configuration-additional-options
 
-            mongodb-configuration
-            mongodb-configuration?
-            mongodb-configuration-mongodb
-            mongodb-configuration-config-file
-            mongodb-configuration-data-directory
-            mongodb-service-type
-
             mysql-service
             mysql-service-type
             mysql-configuration
@@ -521,87 +514,6 @@ created after the PostgreSQL database is started.")))
                                           (const %memcached-accounts))))
                 (default-value (memcached-configuration))))
 
-
-;;;
-;;; MongoDB
-;;;
-
-(define %default-mongodb-configuration-file
-  (plain-file
-   "mongodb.yaml"
-   "# GNU Guix: MongoDB default configuration file
-processManagement:
-  pidFilePath: /var/run/mongodb/pid
-storage:
-  dbPath: /var/lib/mongodb
-"))
-
-
-(define-record-type* <mongodb-configuration>
-  mongodb-configuration make-mongodb-configuration
-  mongodb-configuration?
-  (mongodb             mongodb-configuration-mongodb
-                       (default mongodb))
-  (config-file         mongodb-configuration-config-file
-                       (default %default-mongodb-configuration-file))
-  (data-directory      mongodb-configuration-data-directory
-                       (default "/var/lib/mongodb")))
-
-(define %mongodb-accounts
-  (list (user-group (name "mongodb") (system? #t))
-        (user-account
-         (name "mongodb")
-         (group "mongodb")
-         (system? #t)
-         (comment "Mongodb server user")
-         (home-directory "/var/lib/mongodb")
-         (shell (file-append shadow "/sbin/nologin")))))
-
-(define mongodb-activation
-  (match-lambda
-    (($ <mongodb-configuration> mongodb config-file data-directory)
-     #~(begin
-         (use-modules (guix build utils))
-         (let ((user (getpwnam "mongodb")))
-           (for-each
-            (lambda (directory)
-              (mkdir-p directory)
-              (chown directory
-                     (passwd:uid user) (passwd:gid user)))
-            '("/var/run/mongodb" #$data-directory)))))))
-
-(define mongodb-shepherd-service
-  (match-lambda
-    (($ <mongodb-configuration> mongodb config-file data-directory)
-     (shepherd-service
-      (provision '(mongodb))
-      (documentation "Run the Mongodb daemon.")
-      (requirement '(user-processes loopback))
-      (start #~(make-forkexec-constructor
-                `(,(string-append #$mongodb "/bin/mongod")
-                  "--config"
-                  ,#$config-file)
-                #:user "mongodb"
-                #:group "mongodb"
-                #:pid-file "/var/run/mongodb/pid"
-                #:log-file "/var/log/mongodb.log"))
-      (stop #~(make-kill-destructor))))))
-
-(define mongodb-service-type
-  (service-type
-   (name 'mongodb)
-   (description "Run the MongoDB document database server.")
-   (extensions
-    (list (service-extension shepherd-root-service-type
-                             (compose list
-                                      mongodb-shepherd-service))
-          (service-extension activation-service-type
-                             mongodb-activation)
-          (service-extension account-service-type
-                             (const %mongodb-accounts))))
-   (default-value
-     (mongodb-configuration))))
-
 
 ;;;
 ;;; MySQL.