Update to 3.15.3 linux kernel

[SvenDowideit]

No description provided.

[LK4D4]

@SvenDowideit Not sure if this has influence on boot2docker, but there is bug in docker with 3.15 branch: moby/moby#6345

[SvenDowideit]

@LK4D4 thank you for the link - I'll have to test this.

[SvenDowideit]

yes, it looks like this does not apply to boot2docker with this PR:

docker@boot2docker:~$ more /etc/passwd
root:x:0:0:root:/root:/bin/sh
lp:x:7:7:lp:/var/spool/lpd:/bin/sh
nobody:x:65534:65534:nobody:/nonexistent:/bin/false
tc:x:1001:50:Linux User,,,:/home/tc:/bin/sh
docker:x:1000:50:Linux User,,,:/home/docker:/bin/sh
docker@boot2docker:~$ docker run -i -t ubuntu adduser --system --quiet --home /var/lib/postgresql --no-create-home  --shell /bin/bash --group --gecos "PostgreSQL administrator" tc
docker@boot2docker:~$ docker run -i -t ubuntu adduser --system --quiet --home /var/lib/postgresql --no-create-home  --shell /bin/bash --group --gecos "PostgreSQL administrator" docker
docker@boot2docker:~$ 

could someone else please verify this with this PR?