**What**
- journald log provider using exec to journalctl
```
journalctl -t <namespace>:<name> --output=json --since=<timestamp> <--follow> --output-fields=SYSLOG_IDENTIFIER,MESSAGE,_PID,_SOURCE_REALTIME_TIMESTAMP
```
- This can be tested manually using `faas-cli logs` as normal, e.g.
`faas-cli logs nodeinfo` should tail the last 5 mins of logs.
- Very basic tests ensuring that the `journalctl` comamand is correctly
construction and that the json log entrys are parsed correctly.
- Add simple e2e test to grep the function logs
Signed-off-by: Lucas Roesler <roesler.lucas@gmail.com>
When ListFunctions populate it's function map, it should not add
functions that GetFunction returned error.
Signed-off-by: Carlos de Paula <me@carlosedp.com>
The use of containerd and CNI functions has been refactored to reuse
the same codebase.
Added all network functionality to own directory and package. Removed
netlink and weave library in favor of using CNI plugin result files.
Rename containers handler to functions to clear-up functionality.
Signed-off-by: Carlos de Paula <me@carlosedp.com>
