[riot-notifications] [RIOT-OS/RIOT] riotboot: use epoch as APP_VER default (#11180)

Kaspar Schleiser notifications at github.com
Thu Mar 14 12:10:41 CET 2019

### Contribution description

Previously, a compiled image version would default to "0".
It would make an image that was simply compiled by "make riotboot" without specifying a version unbootable by default, as the existing version in slot 0 is always at least 0, too.

This PR makes the current time (in unix epoch format) the default version number. As time is increasing monotonically, that makes an image which was compiled after another bootable with high probability.

### Testing procedure

In order to test that the epoch is used, use ```BOARD=foo make -Ctests/riotboot riotboot/flash```.
On master, after flashing, the printed version number should be zero.
With this PR, it should increase everytime the flashing is repeated.

### Issues/PRs references

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-- Commit Summary --

  * riotboot: use epoch as APP_VER default

-- File Changes --

    M makefiles/boot/riotboot.mk (4)

-- Patch Links --


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