netdev-dummy: disable periodic probing

netdev-dummy is mostly useed over reliable link for testing. Periodic
probing over those links seem overkill.

Signed-off-by: Andy Zhou <azhou@nicira.com>
Acked-by: Ben Pfaff <blp@nicira.com>
tests: Don't rely on strace for IPv6 IDL testcases.

This would cause testsuite failures if someone runs the testsuite
without strace installed.

Signed-off-by: Joe Stringer <joestringer@nicira.com>
Signed-off-by: Ben Pfaff <blp@nicira.com>
datapath: Read tcp flags only then the tranport header is present.

Only the first IP fragment can have a TCP header, check for this.

Signed-off-by: Jarno Rajahalme <jrajahalme@nicira.com>
Signed-off-by: Jesse Gross <jesse@nicira.com>