remove InsecureSkipVerify when downloading images

[glimchb]

see

sztp/sztp-agent/pkg/secureagent/daemon.go

Line 223 in a1c2abf

InsecureSkipVerify: true, // TODO: remove skip verify

and --insecure flag from

sztp/scripts/tests.sh

Lines 39 to 41 in a1c2abf

	"${CURL[@]}" --insecure --request GET "${CERTIFICATES[@]}" --output /tmp/first-boot-image.tst "https://web:443/first-boot-image.img"
	"${CURL[@]}" --insecure --request GET "${CERTIFICATES[@]}" --output /tmp/second-boot-image.tst "https://web:443/second-boot-image.img"
	"${CURL[@]}" --insecure --request GET "${CERTIFICATES[@]}" --output /tmp/third-boot-image.tst "https://web:443/third-boot-image.img"

and

sztp/scripts/tests.sh

Line 94 in a1c2abf

"${CURL[@]}" --insecure --request GET "${CERTIFICATES[@]}" --output "/tmp/${BASENAME}" "${URL}"

[Eeshu-Yadav]

@glimchb i want to contribute in this , can you assign it to me ?

[glimchb]

@Eeshu-Yadav are you working on this ?

[Eeshu-Yadav]

@glimchb my end-sem exams is ongoing , actively contributing after 26 july in this project