Fix typo in minimal epoll polling time
Fix typo in minimal epoll polling time

epoll was supposed to not sleep when timeout
is less than 1ms, but a typo made it not sleep
any time the requested timeout is lower than
1000 seconds (in practice, never...).

This patch replaces "1e3" with "1e-3", which
represents 1ms.

Change-Id: I731851b27a6bf6ab8e41586e017e94b962b09bf3
Signed-off-by: Pierre Pfister <e31bfcc197987a594da168a19bf32d37137e11a7@cisco.com>
(cherry picked from commit ec06222ae189fe8d84b63410130fff04bf446573)

chrisy/vpp,vpp-dev/vpp,vpp-dev/vpp,FDio/vpp,chrisy/vpp,FDio/vpp,vpp-dev/vpp,vpp-dev/vpp,chrisy/vpp,FDio/vpp,vpp-dev/vpp,chrisy/vpp,FDio/vpp,FDio/vpp,FDio/vpp,chrisy/vpp,chrisy/vpp,FDio/vpp,chrisy/vpp,FDio/vpp,vpp-dev/vpp,vpp-dev/vpp,chrisy/vpp