Don't trust HOME or USER env variables

On Ubuntu under sudo, it seems to be very wonky. We already have code to
compute them based on UID, so let's just always do that and never bother
even checking what they come to us as.

Author: reidmv

tasks/enable_replica.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 
-USER="${USER:-$(id -un)}"
-HOME="${HOME:-$(getent passwd "$USER" | cut -d : -f 6)}"
+USER=$(id -un)
+HOME=$(getent passwd "$USER" | cut -d : -f 6)
 
 if [ -z "$PT_token_file" -o "$PT_token_file" = "null" ]; then
   TOKEN_FILE="${HOME}/.puppetlabs/token"

tasks/provision_replica.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 
-USER="${USER:-$(id -un)}"
-HOME="${HOME:-$(getent passwd "$USER" | cut -d : -f 6)}"
+USER=$(id -un)
+HOME=$(getent passwd "$USER" | cut -d : -f 6)
 
 if [ -z "$PT_token_file" -o "$PT_token_file" = "null" ]; then
   TOKEN_FILE="${HOME}/.puppetlabs/token"