Fix cluster command options to be flags by setting is_flag to True

Change-Id: Iefa1472c81e1c809b86bc9bff015b2f083b976fe
Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>
diff --git a/osmclient/cli_commands/cluster.py b/osmclient/cli_commands/cluster.py
index 9e1eb1a..66409ed 100755
--- a/osmclient/cli_commands/cluster.py
+++ b/osmclient/cli_commands/cluster.py
@@ -46,6 +46,7 @@
 )
 @click.option(
     "--bootstrap/--no-bootstrap",
+    is_flag=True,
     required=False,
     default=True,
     help="bootstrap the cluster with Flux (prepare for GitOps) (default=True)",
@@ -280,6 +281,7 @@
 @click.option("--description", default="", help="human readable description")
 @click.option(
     "--bootstrap/--no-bootstrap",
+    is_flag=True,
     required=False,
     default=True,
     help="bootstrap the cluster with Flux (prepare for GitOps) (default=True)",