feat(coreos-base/coreos-base): Add default vimrc so vim acts like vim.

Because, I mean, really.

sdk_container/src/third_party/coreos-overlay/coreos-base/coreos-base/coreos-base-0.ebuild

@@ -128,6 +128,10 @@ src_install() {
 		# Insert glibc's nsswitch.conf since that is installed weirdly
 		doins "${FILESDIR}"/nsswitch.conf
 
+		# Insert a mini vimrc to avoid driving everyone insane
+		insinto /etc/vim
+		doins "${FILESDIR}"/vimrc
+
 		# Symlink /etc/localtime to something on the stateful partition, which we
 		# can then change around at runtime.
 		dosym /var/lib/timezone/localtime /etc/localtime || die

sdk_container/src/third_party/coreos-overlay/coreos-base/coreos-base/files/vimrc

@@ -0,0 +1,18 @@
+" Minimal configuration file for Vim on CoreOS
+"
+" The vim package is installed with USE=minimal to avoid installing lots of
+" extra files but that doesn't mean we like vim acting as if it were vi.
+
+" General settings from Gentoo's default vimrc:
+set nocompatible        " Use Vim defaults (much better!)
+set bs=2                " Allow backspacing over everything in insert mode
+set ruler               " Show the cursor position all the time
+set nomodeline          " We don't allow modelines by default
+
+" Read vimrc from the state partition if it exists.
+if filereadable("/media/state/etc/vim/vimrc")
+  source /etc/vim/vimrc
+endif
+if filereadable("/media/state/etc/vim/vimrc.local")
+  source /etc/vim/vimrc.local
+endif