Build and install from GOPATH

* Rename 'vendor/src' -> 'vendor'
  * Ignore vendor/ instead of vendor/src/ for lint
* Rename 'cmd/client' -> 'cmd/ocic' to make it 'go install'able
* Rename 'cmd/server' -> 'cmd/ocid' to make it 'go install'able
* Update Makefile to build and install from GOPATH
* Update tests to locate ocid/ocic in GOPATH/bin
* Search for binaries in GOPATH/bin instead of PATH
* Install tools using `go get -u`, so they are updated on each run

Signed-off-by: Jonathan Yu <jawnsy@redhat.com>

vendor/github.com/seccomp/libseccomp-golang/README

@@ -0,0 +1,26 @@
+libseccomp-golang: Go Language Bindings for the libseccomp Project
+===============================================================================
+https://github.com/seccomp/libseccomp-golang
+https://github.com/seccomp/libseccomp
+
+The libseccomp library provides an easy to use, platform independent, interface
+to the Linux Kernel's syscall filtering mechanism.  The libseccomp API is
+designed to abstract away the underlying BPF based syscall filter language and
+present a more conventional function-call based filtering interface that should
+be familiar to, and easily adopted by, application developers.
+
+The libseccomp-golang library provides a Go based interface to the libseccomp
+library.
+
+* Online Resources
+
+The library source repository currently lives on GitHub at the following URLs:
+
+	-> https://github.com/seccomp/libseccomp-golang
+	-> https://github.com/seccomp/libseccomp
+
+The project mailing list is currently hosted on Google Groups at the URL below,
+please note that a Google account is not required to subscribe to the mailing
+list.
+
+	-> https://groups.google.com/d/forum/libseccomp