Add trunk egresses to resolved egresses.
Add trunk egresses to resolved egresses.

Summary:
On programming a host entry with a corresponding trunk egress, the trunk egress id is added to resolvedEgresses_.

Prior to this, resolved trunk egresses would have been incorrectly skipped over in BcmEcmpEgress::program()- breaking ECMP over aggregate ports.

Reviewed By: boryas

Differential Revision: D5348470

fbshipit-source-id: 0f2577a13152216e02f5253efe853c6e11d0c800

peterlei/fboss,peterlei/fboss,peterlei/fboss,peterlei/fboss