medium: report: Make setting report period more robust (bnc#882959)
high: ui_history: Lazily fetch report data on command (bnc#882959)

Don't retrieve report data until actually needed, so that
tab completion won't stall on querying the live cluster.
dev: ui_history: Remove unused command
Merge pull request #36 from krig/report-fixes

Fix issues with tab completion in the history UI (bnc#882959)