Podman service silently fails if a handler panics

[jwhonce]

Is this a BUG REPORT or FEATURE REQUEST? (leave only one on its own line)

/kind bug

Description

If code in a handler panics, there is no report to the client.

Steps to reproduce the issue:

1. curl --unix-socket /run/podman/podman.sock -v http://localhost/v1.40/containers/json?all=True

Describe the results you received:

• Trying /run/podman/podman.sock:0...
• Connected to localhost (/run/podman/podman.sock) port 80 (#0)

GET /v1.40/containers/json?all=True HTTP/1.1
Host: localhost
User-Agent: curl/7.66.0
Accept: /

• Empty reply from server
• Connection #0 to host localhost left intact
  curl: (52) Empty reply from server

Describe the results you expected:
Populated result from server. At a minimum a 500 with details logged on the server

Additional information you deem important (e.g. issue happens only occasionally):

Output of podman version:

Version:            1.7.1-dev
RemoteAPI Version:  1
Go Version:         go1.12.13
Git Commit:         8beeb067aac857deb29e91562cf4b6f068fe0328-dirty
Built:              Thu Jan 23 14:32:52 2020
OS/Arch:            linux/amd64

Output of podman info --debug:

debug:
  compiler: gc
  git commit: c02b3b5e139de90f7e03a5b08b5c49add8107380-dirty
  go version: go1.12.13
  podman version: 1.8.1-dev
host:
  BuildahVersion: 1.13.1
  CgroupVersion: v2
  Conmon:
    package: conmon-2.0.10-2.fc31.x86_64
    path: /usr/bin/conmon
    version: 'conmon version 2.0.10, commit: 6b526d9888abb86b9e7de7dfdeec0da98ad32ee0'
  Distribution:
    distribution: fedora
    version: "31"
  IDMappings:
    gidmap:
    - container_id: 0
      host_id: 17945
      size: 1
    - container_id: 1
      host_id: 100000
      size: 65536
    uidmap:
    - container_id: 0
      host_id: 17945
      size: 1
    - container_id: 1
      host_id: 100000
      size: 65536
  MemFree: 1973223424
  MemTotal: 33487138816
  OCIRuntime:
    name: crun
    package: crun-0.10.6-1.fc31.x86_64
    path: /usr/bin/crun
    version: |-
      crun version 0.10.6
      spec: 1.0.0
      +SYSTEMD +SELINUX +APPARMOR +CAP +SECCOMP +EBPF +YAJL
  SwapFree: 16298274816
  SwapTotal: 16877875200
  arch: amd64
  cpus: 8
  eventlogger: journald
  hostname: jhonce-fc.local
  kernel: 5.4.15-200.fc31.x86_64
  os: linux
  rootless: true
  slirp4netns:
    Executable: /usr/bin/slirp4netns
    Package: slirp4netns-0.4.0-20.1.dev.gitbbd6f25.fc31.x86_64
    Version: |-
      slirp4netns version 0.4.0-beta.3+dev
      commit: bbd6f25c70d5db2a1cd3bfb0416a8db99a75ed7e
  uptime: 95h 57m 32.96s (Approximately 3.96 days)
registries:
  search:
  - docker.io
  - registry.fedoraproject.org
  - registry.access.redhat.com
  - registry.centos.org
  - quay.io
store:
  ConfigFile: /home/jhonce/.config/containers/storage.conf
  ContainerStore:
    number: 10
  GraphDriverName: overlay
  GraphOptions:
    overlay.mount_program:
      Executable: /usr/bin/fuse-overlayfs
      Package: fuse-overlayfs-0.7.5-2.fc31.x86_64
      Version: |-
        fusermount3 version: 3.6.2
        fuse-overlayfs: version 0.7.5
        FUSE library version 3.6.2
        using FUSE kernel interface version 7.29
  GraphRoot: /home/jhonce/.local/share/containers/storage
  GraphStatus:
    Backing Filesystem: extfs
    Native Overlay Diff: "false"
    Supports d_type: "true"
    Using metacopy: "false"
  ImageStore:
    number: 16
  RunRoot: /run/user/17945
  VolumePath: /home/jhonce/.local/share/containers/storage/volumes```

**Package info (e.g. output of `rpm -q podman` or `apt list podman`):**

Built from master

**Additional environment details (AWS, VirtualBox, physical, etc.):**