build: Have travis-ci run integration tests in parallel.
build: Have travis-ci run integration tests in parallel.

This partially reverts 24fb1306e0204c931bb0cab63d04c6534d49bb78 now that
we have a fix for the race condition identified. We keep the additional
`check-programs` target around for convenience.

Signed-off-by: Philip Tricca <fd418754d31777cf39b16b99b0350486ab840079@intel.com>

01org/tpm2-tss,01org/tpm2-tss,01org/TPM2.0-TSS,01org/tpm2-tss,01org/TPM2.0-TSS,tpm2-software/tpm2-tss,tpm2-software/tpm2-tss,01org/TPM2.0-TSS,tpm2-software/tpm2-tss,01org/TPM2.0-TSS