pkg/bpf: add additional logging and error handling
pkg/bpf: add additional logging and error handling

* Add logs for when we append to list of maps to open after bpffs is mounted.
* Log errors that occur when opening / creating maps which are stored in list
of maps to open after bpffs is mounted.

Signed-off by: Ian Vernon <ian@cilium.io>

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