fix #2920: cifs: add options parameter

This makes it possible to add all mount options offered by mount.cifs.
NFS & CIFS now share the options parameter since they use it for the
same purpose.

Signed-off-by: Stefan Hrdlicka <s.hrdlicka@proxmox.com>
 [FE: rebase + style fixes]
Signed-off-by: Fiona Ebner <f.ebner@proxmox.com>
Tested-by: Friedrich Weber <f.weber@proxmox.com>
 [T: fix merge conflict ]
Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>

src/PVE/Storage/Plugin.pm

@@ -192,6 +192,12 @@ my $defaultData = {
 	    type => "string", format => "pve-dir-override-list",
 	    optional => 1,
 	},
+	options => {
+	    description => "NFS/CIFS mount options (see 'man nfs' or 'man mount.cifs')",
+	    type => 'string',
+	    format => 'pve-storage-options',
+	    optional => 1,
+	},
     },
 };