fix: use the correct proxy file locations (#131)

The configure-proxy.sh script adds a superfluous "/tmp/" prefix
to the proxy file paths:

```
HTTP_PROXY_FILE="/tmp/capi/etc/http-proxy"
HTTPS_PROXY_FILE="/tmp/capi/etc/https-proxy"
NO_PROXY_FILE="/tmp/capi/etc/no-proxy"
ENVIRONMENT_FILE="/tmp/etc/environment"
```

For this reason, the proxy settings are not applied correctly.

We'll fix the issue by simply removing the "/tmp/" prefix.

Fixes: #125

Author: petrutlucian94

pkg/cloudinit/scripts/configure-proxy.sh

@@ -3,10 +3,10 @@
 # Assumptions:
 #   - runs before install k8s
 
-HTTP_PROXY_FILE="/tmp/capi/etc/http-proxy"
-HTTPS_PROXY_FILE="/tmp/capi/etc/https-proxy"
-NO_PROXY_FILE="/tmp/capi/etc/no-proxy"
-ENVIRONMENT_FILE="/tmp/etc/environment"
+HTTP_PROXY_FILE="/capi/etc/http-proxy"
+HTTPS_PROXY_FILE="/capi/etc/https-proxy"
+NO_PROXY_FILE="/capi/etc/no-proxy"
+ENVIRONMENT_FILE="/etc/environment"
 
 if [ -f ${HTTP_PROXY_FILE} ]; then
   HTTP_PROXY=$(cat ${HTTP_PROXY_FILE})