Add podman pod top

Using the vendored changes from psgo, incorporate JoinNamespaceAndProcessInfoByPids to get process information for each pid namespace of running containers in the pod. Also added a man page, and tests.

Signed-off-by: haircommander <pehunt@redhat.com>

Closes: #1298
Approved by: mheon

1 files changed, 92 insertions, 0 deletions

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+% podman-pod-top "1"
+
+## NAME
+podman\-pod\-top - Display the running processes of containers in a pod
+
+## SYNOPSIS
+**podman top** [*options*] *pod* [*format-descriptors*]
+
+## DESCRIPTION
+Display the running process of containers in a pod. The *format-descriptors* are ps (1) compatible AIX format descriptors but extended to print additional information, such as the seccomp mode or the effective capabilities of a given process.
+
+## OPTIONS
+
+**--help, -h**
+
+  Print usage statement
+
+**--latest, -l**
+
+Instead of providing the pod name or ID, use the last created pod.
+
+## FORMAT DESCRIPTORS
+
+The following descriptors are supported in addition to the AIX format descriptors mentioned in ps (1):
+
+**args, capbnd, capeff, capinh, capprm, comm, etime, group, hgroup, hpid, huser, label, nice, pcpu, pgid, pid, ppid, rgroup, ruser, seccomp, state, time, tty, user, vsz**
+
+**capbnd**
+
+  Set of bounding capabilities. See capabilities (7) for more information.
+
+**capeff**
+
+  Set of effective capabilities. See capabilities (7) for more information.
+
+**capinh**
+
+  Set of inheritable capabilities. See capabilities (7) for more information.
+
+**capprm**
+
+  Set of permitted capabilities. See capabilities (7) for more information.
+
+**hgroup**
+
+  The corresponding effective group of a container process on the host.
+
+**hpid**
+
+  The corresponding host PID of a container process.
+
+**huser**
+
+  The corresponding effective user of a container process on the host.
+
+**label**
+
+  Current security attributes of the process.
+
+**seccomp**
+
+  Seccomp mode of the process (i.e., disabled, strict or filter). See seccomp (2) for more information.
+
+**state**
+
+  Process state codes (e.g, **R** for *running*, **S** for *sleeping*). See proc(5) for more information.
+
+## EXAMPLES
+
+By default, `podman-top` prints data similar to `ps -ef`:
+
+```
+ # podman pod top b031293491cc
+USER   PID   PPID   %CPU    ELAPSED             TTY   TIME   COMMAND
+root   1     0      0.000   2h5m38.737137571s   ?     0s     top
+root   8     0      0.000   2h5m15.737228361s   ?     0s     top
+```
+
+The output can be controlled by specifying format descriptors as arguments after the pod:
+
+```
+ # podman pod top -l pid seccomp args %C
+PID   SECCOMP   COMMAND   %CPU
+1     filter    top       0.000
+1     filter    /bin/sh   0.000
+```
+
+## SEE ALSO
+podman-pod(1), ps(1), seccomp(2), proc(5), capabilities(7)
+
+## HISTORY
+August 2018, Originally compiled by Peter Hunt <pehunt@redhat.com>