improve all probes for all components

[edevosc2c]

• Switch container port name from http-proxy to http: http-proxy word is confusing, it's not an HTTP proxy.
• Add healthcheck probes to components that didn't have it.
• Stop using tcpCheck and instead use httpCheck for being 100% sure that the traffic can flow to the application.
• When possible use the named container port for things like liveness, service and more. This allows to specify the application number port only once.
• Remove case for old Kubernetes version in default ingress

TODO:

• Need to make sure that all the probes won't affect the startup of all apps.
• allow customization of liveness and startup probes

[jeanpommier]

LGTM. Nice job !