CA-264428: Use --batch when calling gpg
CA-264428: Use --batch when calling gpg

If the `import-update-key` script is used when a TTY is not available (e.g.
during RPM installation), it can result in a situation where the key is
imported, but not marked as trusted. By passing `--batch` we avoid this
situation.

Signed-off-by: Alex Brett <1cb06bfa997a33a00cb43664f08580938a051c48@citrix.com>

euanh/xen-api,srowe/xen-api,euanh/xen-api,srowe/xen-api,srowe/xen-api,euanh/xen-api,srowe/xen-api,euanh/xen-api,srowe/xen-api,euanh/xen-api,euanh/xen-api