Simply sideloading and purge instructions

Signed-off-by: Thomas Parrott <[email protected]>

README.md

@@ -10,8 +10,7 @@ For faster repeated runs, you might want to tell `snap` that it can purge the LX
 without taking any snapshot:
 
 ```
-export PURGE_LXD=1
-./bin/local-run tests/interception latest/edge
+PURGE_LXD=1 ./bin/local-run tests/interception latest/edge
 ```
 
 Note: if you need to run tests on temporary machines, [Testflinger reservations](https://docs.google.com/document/d/11Kot68mnBY9Wq9DXRzTVrKpx5cMkkhBC5RrM51eyybY) might be useful.
@@ -20,8 +19,7 @@ To test a custom build of LXD, you can set the `LXD_SIDELOAD_PATH` environment v
 This will be copied to `/var/snap/lxd/common/lxd.debug` and the daemon will be reloaded before the test run.
 
 ```
-export LXD_SIDELOAD_PATH=/tmp/lxd
-./bin/local-run tests/interception latest/edge
+LXD_SIDELOAD_PATH=/tmp/lxd ./bin/local-run tests/interception latest/edge
 ```