Improve feedback in test-push when device is too old

[nickvergessen]

Before

$ occ notification:test-push … --talk
Trying to push to 1 devices

Language is set to de_DE
Private user key size: 1704
Public user key size: 451
Identified 1 Talk devices and 0 others.

Device token:98908
$

there is no further message and you wonder what the issue is.

After

$ occ notification:test-push … --talk
Trying to push to 1 devices

Language is set to de_DE
Private user key size: 1704
Public user key size: 451
Identified 1 Talk devices and 0 others.

Device token:98908
Device token "last checked" is older than 60 days: 1601185625
$