make default logger only print to stderr not file

[hzxuzhonghu]

What type of PR is this?

What this PR does / why we need it:

Which issue(s) this PR fixes:
Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

[hzxuzhonghu]

Fix #835

[codecov]

Codecov Report

Attention: Patch coverage is 77.77778% with 2 lines in your changes missing coverage. Please review.

Project coverage is 52.77%. Comparing base (0956425) to head (fb8c42e).
Report is 43 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/logger/logger.go	77.77%	2 Missing ⚠️

Files with missing lines	Coverage Δ
pkg/auth/rbac.go	79.77% <ø> (ø)
pkg/bpf/bpf.go	41.81% <ø> (ø)
pkg/cache/v2/listener.go	49.33% <ø> (ø)
pkg/cache/v2/maps/listener.go	36.11% <ø> (ø)
pkg/cni/install.go	36.50% <ø> (ø)
pkg/cni/plugin/plugin.go	0.00% <ø> (ø)
pkg/controller/ads/ads_controller.go	93.33% <ø> (ø)
pkg/controller/bypass/bypass_controller.go	34.09% <ø> (ø)
pkg/controller/config/config.go	63.46% <ø> (ø)
pkg/controller/controller.go	0.00% <ø> (ø)
... and 9 more

... and 3 files with indirect coverage changes

---

Continue to review full report in Codecov by Sentry.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update d83baf8...fb8c42e. Read the comment docs.

[LiZhenCheng9527]

nit:

Suggested change

	log = logger.NewLoggerScope("pkg/telemetry")
	log = logger.NewLoggerScope("telemetry")

or controller/telemetry

[YaoZengzeng]

Suggested change

	log = logger.NewLoggerScope("pkg/auth")
	log = logger.NewLoggerScope("auth")

pkg as prefix doens't seem to make sense?

[YaoZengzeng]

Suggested change

	log = logger.NewLoggerScope("pkg/bpf")
	log = logger.NewLoggerScope("bpf")

ditto

[Okabe-Rintarou-0]

/lgtm

[nlgwcy]

/lgtm
/approve

[kmesh-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: nlgwcy

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [nlgwcy]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment