CLOUD-3175: avoid using rdctl for switching to virtiofs (#92)

Turns out rancher needs to actually be running to use `rdctl` to modify
settings:
```
$ $HOME/.rd/bin/rdctl set --experimental.virtual-machine.mount.type virtiofs
Error: connection refused
```

This PR changes to updating the plist file instead to use virtiofs.

VERSION

@@ -1 +1 @@
-0.1.52
+0.1.53

formula/ih-core.rb

@@ -1,5 +1,5 @@
 class IhCore < Formula
-  VERSION="0.1.52"
+  VERSION="0.1.53"
   desc "Brew formula for installing core tools used at Included Health engineering."
   homepage "https://github.com/ConsultingMD/homebrew-ih-public"
   license "CC BY-NC-ND 4.0"

lib/core/rancher/step.sh

@@ -59,7 +59,9 @@ function ih::setup::core.rancher::test() {
     elif ! grep -q "<string>vz</string>" "$PLIST_DST"; then
       ih::log::debug "The PLIST file needs to be updated to use 'vz' for M3 Macs."
       return 1
-      # TODO: figure out how to check virtual-machine.mount.type (there's no rdctl get)
+    elif ! grep -q "<string>virtiofs</string>" "$PLIST_DST"; then
+      ih::log::debug "The PLIST file needs to be updated to use 'virtiofs' for M3 Macs."
+      return 1
     fi
   fi
 
@@ -167,7 +169,7 @@ function ih::setup::core.rancher::install() {
       elif ! grep -q "<string>vz</string>" "$PLIST_DST"; then
         ih::log::debug "Updating PLIST to use 'vz' for Virtualization for M3 Macs."
         sudo sed -i '' 's/<string>qemu<\/string>/<string>vz<\/string>/g' "$PLIST_DST"
-        $HOME/.rd/bin/rdctl set --experimental.virtual-machine.mount.type virtiofs
+        sudo sed -i '' 's/<string>reverse-sshfs<\/string>/<string>virtiofs<\/string>/g' "$PLIST_DST"
       fi
     fi