Improve TA handling #2799

Job	Run time
softhsm2-test (1.74.0, hsm,hsm-tests-pkcs11)	5m 49s
build (ubuntu-latest, 1.74.0, --no-default-features)	6m 58s
softhsm2-test (stable, hsm,hsm-tests-pkcs11)	5m 28s
pykmip-test (1.74.0, hsm)	6m 18s
build (ubuntu-latest, 1.74.0)	9m 47s
softhsm2-test (beta, hsm,hsm-tests-pkcs11)	5m 31s
pykmip-test (1.74.0, hsm,hsm-tests-kmip)	6m 25s
pykmip-test (stable, hsm)	5m 22s
build (ubuntu-latest, 1.74.0, --features all)	9m 12s
build (ubuntu-latest, stable, --no-default-features)	7m 10s
build (ubuntu-latest, stable)	9m 2s
build (ubuntu-latest, stable, --features all)	10m 16s
pykmip-test (stable, hsm,hsm-tests-kmip)	6m 16s
build (ubuntu-latest, beta, --no-default-features)	6m 48s
pykmip-test (beta, hsm)	5m 15s
build (ubuntu-latest, beta)	9m 19s
pykmip-test (beta, hsm,hsm-tests-kmip)	5m 44s
build (ubuntu-latest, beta, --features all)	8m 43s
	2h 9m 23s

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