[ upstream commit dd79107 ]

[ backporter's notes:
  - modified Watcher's New method to not
    take the logger arg and use the old logger
  - skipped changes in pkg/k8s/client/restConfig_provider.go
    (not present in the target branch)
]

Remove reliance on fsnotify by replacing with a polling
mechanism to check for modifications to tracked files.

There is a default interval that is configurable depending
on the usage, and it is also significantly shortened when
running tests.

Signed-off-by: Glib Smaga <code@gsmaga.com>
Signed-off-by: Rastislav Szabo <rastislav.szabo@isovalent.com>