Add testing with RSA keys encrypted with a passphrase (#360) #603

Job	Run time
custom-install-linux	8s
default-linux	7s
default-linux-with-examples	7s
default-win	2m 36s
min-req	8m 55s
root-hint-install-linux	7s
no-base64	7s
custom-install-win	3m 8s
preset-support-but-not-enough	11m 29s
no-pico	7s
with-hunter	3m 11s
with-wolfssl	47s
with-libressl	1m 19s
	32m 8s

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