Updating scan schedule in storage insight does not clear old schedule's cron entry

[purushotham-s]

System information

Type	Version/Name
Distribution Name	CentOS
Distribution Version	7.4
Linux Kernel	3.10.0-693.el7
Architecture	x86_64
IntegralSTOR Version	Master (tmp_code_structure_changes)

Describe the problem you're observing

When a scan schedule in storage insights is updated for a configuration it does not remove the old schedule's crontab entry.

Describe the expected behaviour

Clear old scan schedule's cron entry when a schedule is updated.

Describe how to reproduce the problem

• Create a scan configuration in Storage insights.
• Create a scan schedule for that configuration.
• Update the scan schedule.
• Check crontab entry on the server with # crontab -l and you will find entries for both current and previous scan schedule.

[fractalram]

Fixed with PR number 473