Add basic pagination

- changed click.echo to click.echo_via_pager for a `less` style output
- also changed SingleTable for DoubleTable as single table was
displaying table borders as q's, n's and u's with the pager. This is
similar to what was happening with Wil's and PuTTy and seesms to be
known issue (Robpol86/terminaltables#57)

Author: DavidMarchant

share/appliance_cli/src/text.py

@@ -1,6 +1,6 @@
 
 import click
-from terminaltables import SingleTable
+from terminaltables import DoubleTable
 import textwrap
 
 
@@ -42,9 +42,9 @@ def display_table(headers, data):
     bolded_headers = [bold(header) for header in headers]
     table_data = [bolded_headers] + data
 
-    table = SingleTable(table_data)
+    table = DoubleTable(table_data)
     table.inner_row_border = True
-    click.echo(table.table)
+    click.echo_via_pager(table.table)
 
 
 def help_text_literal_paragraph(*parts):