ipmi::user: Mask passwords

If an exec command fails then the entire command including passwords is
included in the output.

The CR updates the commands that have a password to be Sensitive
ensuring the are redacted from output and logs.

The new output looks like
(of course now i cant recreate it :/)

manifests/user.pp

@@ -67,9 +67,10 @@
     }
 
     exec { "ipmi_user_setpw_${title}":
-      command => "/usr/bin/ipmitool user set password ${user_id} \'${real_password}\'",
-      unless  => "/usr/bin/ipmitool user test ${user_id} 16 \'${real_password}\'",
-      notify  => [Exec["ipmi_user_enable_${title}"], Exec["ipmi_user_enable_sol_${title}"], Exec["ipmi_user_channel_setaccess_${title}"]],
+      environment => [ "PASSWORD=${real_password}" ],
+      command     => "/usr/bin/ipmitool user set password ${user_id} \'\$PASSWORD\'",
+      unless      => "/usr/bin/ipmitool user test ${user_id} 16 \'\$PASSWORD\'",
+      notify      => [Exec["ipmi_user_enable_${title}"], Exec["ipmi_user_enable_sol_${title}"], Exec["ipmi_user_channel_setaccess_${title}"]],
     }
 
     exec { "ipmi_user_enable_sol_${title}":