Allow show ztp to display non-sensitive information visible to non-ro…

…ot user (sonic-net#872)

Removed user privileges checks. These changes fix sonic-net#800. The ZTP PR sonic-net/sonic-ztp#13 is also required for these changes to work as expected.

```
admin@sonic:~$ show ztp status
ZTP Admin Mode : True
ZTP Service : Processing
ZTP Status : IN-PROGRESS
ZTP Source : local-fs (/host/ztp/ztp_data_local.json)
Runtime : 06m 26s
Timestamp : 2020-04-08 13:08:22 UTC

ZTP Service is active

01-test-plugin: IN-PROGRESS
```

Signed-off-by: Rajendra Dendukuri <rajendra.dendukuri@broadcom.com>

show/main.py

@@ -2848,9 +2848,6 @@ def ztp(status, verbose):
     if os.path.isfile('/usr/bin/ztp') is False:
         exit("ZTP feature unavailable in this image version")
 
-    if os.geteuid() != 0:
-        exit("Root privileges are required for this operation")
-
     cmd = "ztp status"
     if verbose:
        cmd = cmd + " --verbose"