fix: release table_entry with the move operator and add default constructor for table_entry

[therealbobo]

What type of PR is this?

Uncomment one (or more) /kind <> lines:

/kind bug

/kind cleanup

/kind design

/kind documentation

/kind failing-test

/kind feature

Any specific area of the project related to this PR?

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/area build

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What this PR does / why we need it:

The table_entry class was missing the default constructor.
The table_entry move operator didn't clean up the left hand side table_entry when moving

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

[poiana]

@therealbobo: The label(s) kind/design cannot be applied, because the repository doesn't have them.

In response to this:

What type of PR is this?

Uncomment one (or more) /kind <> lines:

/kind bug

/kind cleanup

/kind design

/kind documentation

/kind failing-test

/kind feature

Any specific area of the project related to this PR?

Uncomment one (or more) /area <> lines:

/area build

/area plugin-sdk

/area tests

What this PR does / why we need it:

The table_entry class was missing the default constructor.
The table_entry move operator didn't clean up the left hand side table_entry when moving

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

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[poiana]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mstemm, therealbobo

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[poiana]

LGTM label has been added.

Git tree hash: 5e974c99c30e68c93fee1bf92ae6b10390768deb