Use click.echo_via_pager for VM log output

Addresses #67

client-cli/cli_lib/vm.py

@@ -311,7 +311,7 @@ def vm_locks(config, vm):
 
 def view_console_log(config, vm, lines=100):
     """
-    Return console log lines from the API and display them in a pager
+    Return console log lines from the API (and display them in a pager in the main CLI)
 
     API endpoint: GET /vm/{vm}/console
     API arguments: lines={lines}
@@ -334,17 +334,7 @@ def view_console_log(config, vm, lines=100):
     shrunk_log = console_log.split('\n')[-lines:]
     loglines = '\n'.join(shrunk_log)
 
-    # Show it in the pager (less)
-    try:
-        pager = subprocess.Popen(['less', '-R'], stdin=subprocess.PIPE)
-        pager.communicate(input=loglines.encode('utf8'))
-    except FileNotFoundError:
-        ainformation = list()
-        ainformation.append("Error: `less` pager not found, dumping log ({} lines) to stdout".format(lines))
-        ainformation.append(loglines)
-        return False, '\n'.join(ainformation)
-
-    return True, ''
+    return True, loglines
 
 def follow_console_log(config, vm, lines=10):
     """

client-cli/pvc.py

@@ -779,7 +779,7 @@ def vm_flush_locks(domain):
     'domain'
 )
 @click.option(
-    '-l', '--lines', 'lines', default=100, show_default=True,
+    '-l', '--lines', 'lines', default=1000, show_default=True,
     help='Display this many log lines from the end of the log buffer.'
 )
 @click.option(
@@ -788,13 +788,15 @@ def vm_flush_locks(domain):
 )
 def vm_log(domain, lines, follow):
     """
-	Show console logs of virtual machine DOMAIN on its current node in the 'less' pager or continuously. DOMAIN may be a UUID or name. Note that migrating a VM to a different node will cause the log buffer to be overwritten by entries from the new node.
+	Show console logs of virtual machine DOMAIN on its current node in a pager or continuously. DOMAIN may be a UUID or name. Note that migrating a VM to a different node will cause the log buffer to be overwritten by entries from the new node.
     """
 
     if follow:
         retcode, retmsg = pvc_vm.follow_console_log(config, domain, lines)
     else:
         retcode, retmsg = pvc_vm.view_console_log(config, domain, lines)
+        click.echo_via_pager(retmsg)
+        retmsg = ''
     cleanup(retcode, retmsg)
 
 ###############################################################################