build: move e2e dependencies into e2e/go.mod

Several packages are only used while running the e2e suite. These
packages are less important to update, as the they can not influence the
final executable that is part of the Ceph-CSI container-image.

By moving these dependencies out of the main Ceph-CSI go.mod, it is
easier to identify if a reported CVE affects Ceph-CSI, or only the
testing (like most of the Kubernetes CVEs).

Signed-off-by: Niels de Vos <ndevos@ibm.com>

e2e/vendor/github.com/distribution/reference/MAINTAINERS

@@ -0,0 +1,26 @@
+# Distribution project maintainers & reviewers
+#
+# See GOVERNANCE.md for maintainer versus reviewer roles
+#
+# MAINTAINERS (cncf-distribution-maintainers@lists.cncf.io)
+# GitHub ID, Name, Email address
+"chrispat","Chris Patterson","chrispat@github.com"
+"clarkbw","Bryan Clark","clarkbw@github.com"
+"corhere","Cory Snider","csnider@mirantis.com"
+"deleteriousEffect","Hayley Swimelar","hswimelar@gitlab.com"
+"heww","He Weiwei","hweiwei@vmware.com"
+"joaodrp","João Pereira","jpereira@gitlab.com"
+"justincormack","Justin Cormack","justin.cormack@docker.com"
+"squizzi","Kyle Squizzato","ksquizzato@mirantis.com"
+"milosgajdos","Milos Gajdos","milosthegajdos@gmail.com"
+"sargun","Sargun Dhillon","sargun@sargun.me"
+"wy65701436","Wang Yan","wangyan@vmware.com"
+"stevelasker","Steve Lasker","steve.lasker@microsoft.com"
+#
+# REVIEWERS
+# GitHub ID, Name, Email address
+"dmcgowan","Derek McGowan","derek@mcgstyle.net"
+"stevvooe","Stephen Day","stevvooe@gmail.com"
+"thajeztah","Sebastiaan van Stijn","github@gone.nl"
+"DavidSpek", "David van der Spek", "vanderspek.david@gmail.com"
+"Jamstah", "James Hewitt", "james.hewitt@gmail.com"