global vars, move common_pkgs to install-packages role defaults

globals.yaml

@@ -4,13 +4,3 @@ zfs_disk: /dev/vdb
 zfs_arc_size_mb: "{{ (ansible_memtotal_mb * 0.20)|int|abs }}"
 zfs_arc_size_bytes: "{{ zfs_arc_size_mb }}000000"
 pwgen: "{{ lookup('password', '/dev/null chars=ascii_letters,digits,hexdigits,punctuation length=32') }}"
-common_pkgs:
-  - bash-completion
-  - htop
-  - vim
-  - strace
-  - dmidecode
-  - nethogs
-  - sysbench
-  - fio
-  - rsync