Add instructions in new Che launcher how to get Che server logs

[garagatyi]

Now new docker launcher shows instruction how to get Che server logs during start of Che server.
But if terminal where start was performed is closed or history is lost user doesn't know how to get Che server logs.
So we should add command to get logs or add instruction to Che launcher help.

[l0rd]

What about a revamped codenvy/che-launcher info command:

DEBUG: ---------------------------------------
DEBUG: ---------  CHE DEBUG INFO   -----------
DEBUG: ---------------------------------------
DEBUG:
DEBUG: ----------  PLATFORM INFO   -----------
DEBUG: DOCKER_INSTALL_TYPE       = docker4mac
DEBUG: DOCKER_HOST_OS            = fedora/centos/ubuntu/debian
DEBUG: DOCKER_HOST_IP            = 
DEBUG: DOCKER_DAEMON_VERSION     = 
DEBUG:
DEBUG:
DEBUG: ---- CHE INSTANCE INFO  -----------
DEBUG: CHE CONTAINER STATUS      = running/stopped
DEBUG: CHE SERVER SERVER STATUS  = running/not responding
DEBUG: CHE IMAGE                 = codenvy/che-server:nightly
DEBUG: CHE CONF FOLDER           = 
DEBUG: CHE DATA FOLDER           = 
DEBUG: CHE SERVER CONTAINER ID   = 
DEBUG: CHE WORKSPACES IDs        = 
DEBUG: CHE WORKSPACES CONTAINERS = 
DEBUG: CHE DASHBOARD URL         = http://localhost:8080/ 
DEBUG: CHE API URL               = http://localhost:8080/api/
DEBUG: CHE LOGS                  = Run `docker logs -f che-server` 
DEBUG:
DEBUG:
DEBUG: ---- CURRENT COMMAND LINE OPTIONS ----
DEBUG: CHE_PORT                  = 8080
DEBUG: CHE_VERSION               = nightly
DEBUG: CHE_RESTART_POLICY        = no
DEBUG: CHE_USER                  = root
DEBUG: CHE_HOST_IP               = 192.168.65.2
DEBUG: CHE_LOG_LEVEL             = info
DEBUG: CHE_HOSTNAME              = localhost
DEBUG: CHE_DATA_FOLDER           = /Users/mloriedo/tmp/che
DEBUG: CHE_CONF_FOLDER           = not set
DEBUG: CHE_LOCAL_BINARY          = not set
DEBUG: CHE_SERVER_CONTAINER_NAME = che-server
DEBUG: CHE_SERVER_IMAGE_NAME     = codenvy/che-server
DEBUG:

All these infos should be easily retrieved and could help a lot when troubleshooting.

[TylerJewell]

@l0rd @garagatyi @bmicklea - see PR: #1957. I implemented all of the requested features.