dpif: Fix crash in format_odp_actions() due to NULL actions.

When flow_get fails (in this case flow does not exist) simply log
the key part of the get and erase the rest of the flow because it
is invalid.

Verified the fix by doing ovs-ofctl del-flows when traffic is running.

2014-10-18T20:12:13.785Z|00011|dpif(revalidator20)|WARN|system@ovs-system: failed to flow_get (No such file or directory) dp_hash(0),recirc_id(0),skb_priority(0),in_port(2),skb_mark(0),eth(src=00:13:72:0b:52:fa,dst=00:14:72:0b:52:fa),eth_type(0x0800),ipv4(src=10.0.0.164,dst=11.0.0.164,proto=6,tos=0,ttl=4,frag=no),tcp(src=1651,dst=6095),tcp_flags(ack), packets:0, bytes:0, used:never

Signed-off-by: Madhu Challa <challa@noironetworks.com>
Signed-off-by: Ben Pfaff <blp@nicira.com>
These changes cause shared objects to be built by default. Original
behavior of building static objects excusively may be accomplished by
providing the --disable-shared argument to configure. Additionally,
versioning is introduced to each of the shared objects paving the way
for APIs to be built around them.

Signed-off-by: Scott Mann <smann@noironetworks.com>
Specify fully qualified path to libintel_dpdk.a so that OVS shared
object build completes successfully.

Signed-off-by: Scott Mann <smann@noironetworks.com>