[gardenctl]

Improvements

[OPERATOR] fix gardenctl ssh causing Prisma alerts issue
[OPERATOR] global switch -d or --debug to enable debug logging, two functions which could be utilized in whole gardenctl project, GardenctlDebugLog to output debug msg only when debug switch enabled, GardenctlInfoLog to display msg all the time (#262, @neo-liang-sap)
[OPERATOR] Limit SSH node security group to Bastion IP (#254, @jfortin-sap)
[OPERATOR] add logging package github.com/gardener/gardener/pkg/logger to enable internal verbose logging (#250, @neo-liang-sap)
[OPERATOR] 1. fix nc command hanging and timeout. 2. cleaned resource up after nc command timeout. (#247, @tedteng)
[OPERATOR] display eu-access restriction warning msg in gardenctl terminal if cluster is configed with eu-access and garden config is configed with enabling the eu-access restriction (#245, @neo-liang-sap)
[OPERATOR] pass cloud cli creds once as args on execution only and do not store locally (#244, @jfortin-sap)
[OPERATOR] upgrade gardener/gardener version to v1.5.0 (#242, @neo-liang-sap)
[OPERATOR] fix SSH Operation timed out when user => bastion host (#239, @tedteng)
[OPERATOR] --loki flag is added in the gardenctl logs command (#213, @Kristian-ZH)
- --elasticsearch flag is removed from the gardenctl logs command.