.config: Upgrade kernel version to `3.17.1-gentoo-r1`
Messages for package app-emulation/docker-1.2.0 #2

*   CONFIG_IP_NF_TARGET_MASQUERADE:     is not set when it should be.
*   CONFIG_CGROUP_PERF: is optional for container statistics gathering
* Please check to make sure these options are set correctly.
* Failure to do so may cause unexpected problems.
* Once you have satisfied these options, please try merging
* this package again.
* ERROR: app-emulation/docker-1.2.0::gentoo failed (setup phase):
*   Incorrect kernel configuration options
*
* Call stack:
*             ebuild.sh, line  93:  Called pkg_setup
*   docker-1.2.0.ebuild, line 126:  Called
*   linux-info_pkg_setup
*     linux-info.eclass, line 914:  Called
*     check_extra_config
*     linux-info.eclass, line 808:  Called die
* The specific snippet of code:
*          die "Incorrect kernel configuration options"
*
* If you need support, post the output of `emerge
* --info '=app-emulation/docker-1.2.0::gentoo'`,
* the complete build log and the output of `emerge
* -pqv '=app-emulation/docker-1.2.0::gentoo'`.
* The complete build log is located at
* '/var/tmp/portage/app-emulation/docker-1.2.0/temp/build.log'.
* The ebuild environment file is located at
* '/var/tmp/portage/app-emulation/docker-1.2.0/temp/die.env'.
* Working directory:
* '/usr/lib64/python2.7/site-packages'
* S:
* '/var/tmp/portage/app-emulation/docker-1.2.0/work/docker-1.2.0'