Deleted unused files in sample folder

samples/easy.zone

-
-example.com. SOA  ns.example.com. username.example.com. (
-              2007120710 ; serial number of this zone file
-              1d         ; slave refresh (1 day)
-              1d         ; slave retry time in case of a problem (1 day)
-              4w         ; slave expiration time (4 weeks)
-              1h         ; minimum caching time in case of failed lookups (1 hour)
-              )
-example.com.  NS    ns.full.com           ; ns.example.com is the nameserver for example.com
-example.com.  NS    ns.somewhere.com.     ; ns.somewhere.com is a backup nameserver for example.com
-example.com.  MX    10 mail.example.com.  ; mail.example.com is the mailserver for example.com
-example.com.             MX    20 mail2.example.com. ; Similar to above line, but using "@" to say "use $ORIGIN"
-example.com.             MX    50 mail3.example.com  ; Similar to above line, but using a host within this domain
-example.com.  A     10.0.0.1              ; ip address for "example.com"
-ns.example.com            A     10.0.0.2              ; ip address for "ns.example.com". Since there is no "." after ns, $ORIGIN is attached
-o.example.com.	CNAME	a.e.example.com.
-p.example.com.	CNAME	a.sub.example.com.