ubuntu: Add test files for Ubuntu18.04

Reviewed-by: Fabiano Fidêncio <fabiano@fidencio.org>

tests/isodata/ubuntu/ubuntu18.04/ubuntu-18.04-desktop-amd64.iso.txt

+CD-ROM is in ISO 9660 format
+System id: 
+Volume id: Ubuntu 18.04 LTS amd64
+Volume set id: 
+Publisher id: 
+Data preparer id: XORRISO-1.2.4 2012.07.20.130001, LIBISOBURN-1.2.4, LIBISOFS-1.2.4, LIBBURN-1.2.4
+Application id: 
+Copyright File id: 
+Abstract File id: 
+Bibliographic File id: 
+Volume set size is: 1
+Volume set sequence number is: 1
+Logical block size is: 2048
+Volume size is: 938400
+El Torito VD version 1 found, boot catalog is in sector 201
+Joliet with UCS level 3 found
+Rock Ridge signatures version 1 found
+Eltorito validation header:
+    Hid 1
+    Arch 0 (x86)
+    ID ''
+    Key 55 AA
+    Eltorito defaultboot header:
+        Bootid 88 (bootable)
+        Boot media 0 (No Emulation Boot)
+        Load segment 0
+        Sys type 0
+        Nsect 4
+        Bootoff DFC5B 916571

tests/isodata/ubuntu/ubuntu18.04/ubuntu-18.04-server-amd64.iso.txt

+CD-ROM is in ISO 9660 format
+System id: 
+Volume id: Ubuntu-Server 18.04 LTS amd64
+Volume set id: 
+Publisher id: 
+Data preparer id: XORRISO-1.2.4 2012.07.20.130001, LIBISOBURN-1.2.4, LIBISOFS-1.2.4, LIBBURN-1.2.4
+Application id: 
+Copyright File id: 
+Abstract File id: 
+Bibliographic File id: 
+Volume set size is: 1
+Volume set sequence number is: 1
+Logical block size is: 2048
+Volume size is: 360448
+El Torito VD version 1 found, boot catalog is in sector 2110
+Joliet with UCS level 3 found
+Rock Ridge signatures version 1 found
+Eltorito validation header:
+    Hid 1
+    Arch 0 (x86)
+    ID ''
+    Key 55 AA
+    Eltorito defaultboot header:
+        Bootid 88 (bootable)
+        Boot media 0 (No Emulation Boot)
+        Load segment 0
+        Sys type 0
+        Nsect 4
+        Bootoff D100 53504

tests/isodata/ubuntu/ubuntu18.04/ubuntu-18.04-server-arm64.iso.txt

+CD-ROM is in ISO 9660 format
+System id: 
+Volume id: Ubuntu-Server 18.04 LTS arm64
+Volume set id: 
+Publisher id: 
+Data preparer id: XORRISO-1.2.4 2012.07.20.130001, LIBISOBURN-1.2.4, LIBISOFS-1.2.4, LIBBURN-1.2.4
+Application id: 
+Copyright File id: 
+Abstract File id: 
+Bibliographic File id: 
+Volume set size is: 1
+Volume set sequence number is: 1
+Logical block size is: 2048
+Volume size is: 342740
+El Torito VD version 1 found, boot catalog is in sector 3998
+Joliet with UCS level 3 found
+Rock Ridge signatures version 1 found
+Eltorito validation header:
+    Hid 1
+    Arch 239 (Unknown Arch)
+    ID ''
+    Key 55 AA
+    Eltorito defaultboot header:
+        Bootid 88 (bootable)
+        Boot media 0 (No Emulation Boot)
+        Load segment 0
+        Sys type 0
+        Nsect 380
+        Bootoff 182AF 98991

tests/isodata/ubuntu/ubuntu18.04/ubuntu-18.04-server-ppc64el.iso.txt

+CD-ROM is in ISO 9660 format
+System id: LINUX
+Volume id: Ubuntu-Server 18.04 LTS ppc64
+Volume set id: 
+Publisher id: 
+Data preparer id: 
+Application id: GENISOIMAGE ISO 9660/HFS FILESYSTEM CREATOR (C) 1993 E.YOUNGDALE (C) 1997-2006 J.PEARSON/J.SCHILLING (C) 2006-2007 CDRKIT TEAM
+Copyright File id: 
+Abstract File id: 
+Bibliographic File id: 
+Volume set size is: 1
+Volume set sequence number is: 1
+Logical block size is: 2048
+Volume size is: 377082
+CD-ROM uses ISO 9660:1999 relaxed format
+NO Joliet present
+Rock Ridge signatures version 1 found

tests/isodata/ubuntu/ubuntu18.04/ubuntu-18.04-server-s390x.iso.txt

+CD-ROM is in ISO 9660 format
+System id: LINUX
+Volume id: Ubuntu-Server 18.04 LTS s390x
+Volume set id: 
+Publisher id: 
+Data preparer id: 
+Application id: GENISOIMAGE ISO 9660/HFS FILESYSTEM CREATOR (C) 1993 E.YOUNGDALE (C) 1997-2006 J.PEARSON/J.SCHILLING (C) 2006-2007 CDRKIT TEAM
+Copyright File id: 
+Abstract File id: 
+Bibliographic File id: 
+Volume set size is: 1
+Volume set sequence number is: 1
+Logical block size is: 2048
+Volume size is: 289280
+El Torito VD version 1 found, boot catalog is in sector 1934
+Joliet with UCS level 3 found
+Rock Ridge signatures version 1 found
+Eltorito validation header:
+    Hid 1
+    Arch 0 (x86)
+    ID ''
+    Key 55 AA
+    Eltorito defaultboot header:
+        Bootid 88 (bootable)
+        Boot media 0 (No Emulation Boot)
+        Load segment 0
+        Sys type 0
+        Nsect FFFFE610
+        Bootoff 78F 1935