podman image prune -- implement all flag

we now, by default, only prune dangling images.  if --all is passed, we
prune dangling images AND images that do not have an associated containers.

also went ahead and enabled the podman-remote image prune side of things.

Fixes: #2192

Signed-off-by: baude <bbaude@redhat.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/API.md b/API.md
index fc14f1035..fba6c89ee 100755
--- a/API.md
+++ b/API.md
@@ -65,7 +65,7 @@ in the [API.md](https://github.com/containers/libpod/blob/master/API.md) file in
 
 [func ImageExists(name: string) int](#ImageExists)
 
-[func ImagesPrune() []string](#ImagesPrune)
+[func ImagesPrune(all: bool) []string](#ImagesPrune)
 
 [func ImportImage(source: string, reference: string, message: string, changes: []string) string](#ImportImage)
 
@@ -580,7 +580,7 @@ $ varlink call -m unix:/run/podman/io.podman/io.podman.ImageExists '{"name": "im
 ### <a name="ImagesPrune"></a>func ImagesPrune
 <div style="background-color: #E8E8E8; padding: 15px; margin: 10px; border-radius: 10px;">
 
-method ImagesPrune() [[]string](#[]string)</div>
+method ImagesPrune(all: [bool](https://godoc.org/builtin#bool)) [[]string](#[]string)</div>
 ImagesPrune removes all unused images from the local store.  Upon successful pruning,
 the IDs of the removed images are returned.
 ### <a name="ImportImage"></a>func ImportImage