Add 'kpod login' and 'kpod logout' commands

Signed-off-by: umohnani8 <umohnani@redhat.com>

docs/kpod-login.1.md

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+% kpod(1) kpod-login - Simple tool to login to a registry server
+% Urvashi Mohnani
+# kpod-login "1" "August 2017" "kpod"
+
+## NAME
+kpod-login - Login to a container registry
+
+## SYNOPSIS
+**kpod login**
+[**--help**|**-h**]
+[**--authfile**]
+[**--user**|**-u**]
+[**--password**|**-p**]
+**REGISTRY**
+
+## DESCRIPTION
+**kpod login** logs into a specified registry server with the correct username
+and password. **kpod login** reads in the username and password from STDIN.
+The username and password can also be set using the **username** and **password** flags.
+The path of the authentication file can be specified by the user by setting the **authfile**
+flag. The default path used is **${XDG\_RUNTIME_DIR}/containers/auth.json**.
+
+**kpod [GLOBAL OPTIONS]**
+
+**kpod login [GLOBAL OPTIONS]**
+
+**kpod login [OPTIONS] REGISTRY [GLOBAL OPTIONS]**
+
+## OPTIONS
+
+**--password, -p**
+Password for registry
+
+**--username, -u**
+Username for registry
+
+**--authfile**
+Path of the authentication file. Default is ${XDG_\RUNTIME\_DIR}/containers/auth.json
+
+## EXAMPLES
+
+```
+# kpod login docker.io
+Username: umohnani
+Password:
+Login Succeeded!
+```
+
+```
+# kpod login -u testuser -p testpassword localhost:5000
+Login Succeeded!
+```
+
+```
+# kpod login --authfile authdir/myauths.json docker.io
+Username: umohnani
+Password:
+Login Succeeded!
+```
+
+## SEE ALSO
+kpod(1), kpod-logout(1), crio(8), crio.conf(5)
+
+## HISTORY
+August 2017, Originally compiled by Urvashi Mohnani <umohnani@redhat.com>

docs/kpod-logout.1.md

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+% kpod(1) kpod-logout - Simple tool to logout of a registry server
+% Urvashi Mohnani
+# kpod-logout "1" "August 2017" "kpod"
+
+## NAME
+kpod-logout - Logout of a container registry
+
+## SYNOPSIS
+**kpod logout**
+[**--help**|**-h**]
+[**--authfile**]
+[**--all**|**-a**]
+**REGISTRY**
+
+## DESCRIPTION
+**kpod logout** logs out of a specified registry server by deleting the cached credentials
+stored in the **auth.json** file. The path of the authentication file can be overrriden by the user by setting the **authfile** flag.
+The default path used is **${XDG\_RUNTIME_DIR}/containers/auth.json**.
+All the cached credentials can be removed by setting the **all** flag.
+
+**kpod [GLOBAL OPTIONS]**
+
+**kpod logout [GLOBAL OPTIONS]**
+
+**kpod logout [OPTIONS] REGISTRY [GLOBAL OPTIONS]**
+
+## OPTIONS
+
+**--authfile**
+Path of the authentication file. Default is ${XDG_\RUNTIME\_DIR}/containers/auth.json
+
+**--all, -a**
+Remove the cached credentials for all registries in the auth file
+
+## EXAMPLES
+
+```
+# kpod logout docker.io
+Remove login credentials for https://registry-1.docker.io/v2/
+```
+
+```
+# kpod logout --authfile authdir/myauths.json docker.io
+Remove login credentials for https://registry-1.docker.io/v2/
+```
+
+```
+# kpod logout --all
+Remove login credentials for all registries
+```
+
+## SEE ALSO
+kpod(1), kpod-login(1), crio(8), crio.conf(5)
+
+## HISTORY
+August 2017, Originally compiled by Urvashi Mohnani <umohnani@redhat.com>