Set the resync interval to 10m, instead of the default 10h

[detiber]

What this PR does / why we need it:
Overrides the default resync interval (10h) to 10m

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Related to: #748

Release note:

The resync interval for reconciling MachineSets and MachineDeployments is now 10m instead of the Kubebuilder default of 10h

/milestone v1alpha1
/assign @vincepri

[detiber]

/assign @enxebre

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[vincepri]

/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: detiber, vincepri

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[detiber]

/assign @hardikdr @alvaroaleman

[vincepri]

/lgtm
/milestone v1alpha1

I'll go ahead and merge this PR given that it has been open for more than a week and it's a simple addition to the manager/main.go file.