Impacted versions:
9.0, 10.0, 11.0 (Maybe 8.0)
I don't know if it is really an expected behaviour for odoo but I like to expose it

Steps to reproduce:

1. Open an ir.cron record and change it to:
 - interval: minutes
 - next execution date: now + 1 minute

2. Open the odoo server log

Note: I'm using workers=3 but I don't know if there is possible to reproduce it without workers.

Current behavior:

You will see for each cron execution the following output
```txt
...
2018-06-01 16:18:33,432 20686 INFO 333561-11-0-42aff9-all odoo.modules.registry: Invalidating all model caches after database signaling.
...
2018-06-01 16:17:21,527 20687 INFO 333561-11-0-42aff9-all odoo.modules.loading: loading 1 modules...
2018-06-01 16:17:21,535 20687 INFO 333561-11-0-42aff9-all odoo.modules.loading: 1 modules loaded in 0.01s, 0 queries
2018-06-01 16:17:21,594 20687 INFO 333561-11-0-42aff9-all odoo.modules.loading: loading 206 modules...
2018-06-01 16:17:21,718 20687 INFO 333561-11-0-42aff9-all odoo.modules.loading: 206 modules loaded in 0.12s, 0 queries
2018-06-01 16:17:21,989 20687 INFO 333561-11-0-42aff9-all odoo.modules.loading: Modules loaded.
```

Expected behavior:
 - Review if the method that run from the cron really requires a invalidate cache and delete all registries.
 - Disable "minutes" for cron interval because all cache are deleted then is not valid use them.

Video/Screenshot link (optional):

 - [![IMAGE ALT TEXT HERE](https://img.youtube.com/vi/Be4FIeQjgjk/0.jpg)](https://youtu.be/Be4FIeQjgjk)
import fcntl
    import resource
    import psutil
else:
    
    signal.SIGHUP = -1
try:
    from setproctitle import setproctitle
except ImportError:
    setproctitle = lambda x: None
import openerp
from openerp.modules.registry import RegistryManager
from openerp.release import nt_service_name
import openerp.tools.config as config
from openerp.tools import stripped_sys_argv, dumpstacks, log_ormcache_stats
_logger = logging.getLogger(__name__)
try:
    import watchdog
    from watchdog.observers import Observer
    from watchdog.events import FileCreatedEvent, FileModifiedEvent, FileMovedEvent
except ImportError:
    watchdog = None
SLEEP_INTERVAL = 60     
def memory_info(process):
    """ psutil < 2.0 does not have memory_info, >= 3.0 does not have
    get_memory_info """
    pmem = (getattr(process, 'memory_info', None) or process.get_memory_info)()
    return (pmem.rss, pmem.vms)
class LoggingBaseWSGIServerMixIn(object):