tests: new function monitor_resume
tests: new function monitor_resume

monitor_resume is useful because it behaves the same as monitor_start()
but instead does not overwrite DUMP_FILE. This will be used in follow up
to test multiple runs of the monitor.

Signed-off-by: Alexander Alemayhu <e46fc836cca3acec03944314d1457c2ae6c68ef3@alemayhu.com>

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