agent: Fix --debug-verbose flag
agent: Fix --debug-verbose flag

The version of Viper vendored seems broken when in use with StringSlice.
It is expecting whitespaces instead of coma separated strings.

Move to using a slice variable instead of relying on viper.

Signed-off-by: Thomas Graf <5f50a84c1fa3bcff146405017f36aec1a10a9e38@cilium.io>

scanf/cilium,cilium/cilium,eloycoto/cilium,cilium/cilium,cilium-team/cilium,scanf/cilium,scanf/cilium,scanf/cilium,michi-covalent/cilium,michi-covalent/cilium,cilium-team/cilium,cilium/cilium,eloycoto/cilium,scanf/cilium,eloycoto/cilium,tgraf/cilium,michi-covalent/cilium,eloycoto/cilium,tklauser/cilium,scanf/cilium,eloycoto/cilium,michi-covalent/cilium,tgraf/cilium,cilium/cilium,tklauser/cilium,tgraf/cilium,tgraf/cilium,tklauser/cilium,tgraf/cilium,tklauser/cilium,tklauser/cilium,eloycoto/cilium,michi-covalent/cilium,tgraf/cilium,cilium/cilium,scanf/cilium,eloycoto/cilium