bugfix: fix incomplete data copy of resource filter

[SataQiu]

Signed-off-by: SataQiu shidaqiu2018@gmail.com

What type of PR is this?

/kind bug

What this PR does / why we need it:

// The copy built-in function copies elements from a source slice into a
// destination slice. (As a special case, it also will copy bytes from a
// string to a slice of bytes.) The source and destination may overlap. Copy
// returns the number of elements copied, which will be the minimum of
// len(src) and len(dst).
func copy(dst, src []Type) int

func (dr *filterReadCloser) Read(p []byte) (int, error) will return incomplete data when the data size is larger than the default size of p (32768).
The Read function can be called multi times, we should just use dr.data.Read(p) instead of copy.

Which issue(s) this PR fixes:

Fixes #426 #432

Special notes for your reviewer:

/assign @rambohe-ch

Does this PR introduce a user-facing change?

bugfix: fix incomplete data copy of resource filter

other Note

[rambohe-ch]

@SataQiu Thank you for fixing this bug for specific case.

[rambohe-ch]

/lgtm
/approve

[openyurt-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: rambohe-ch, SataQiu

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