bootutil: Add compressed image flags and TLV, fix misc. bugs in bootutil #2117

Job	Run time
config (RELEASE 2,4,6 SIGNATURE)	9m 28s
config (RELEASE 2,4,6 SIGNATURE LOW)	13m 19s
config (RELEASE 2,4,6 SIGNATURE MEDIUM)	17m 20s
config (RELEASE 8,10 SIGNATURE)	6m 43s
config (RELEASE 8,10 SIGNATURE LOW)	9m 34s
config (RELEASE 8,10 SIGNATURE MEDIUM)	11m 55s
config (MINSIZEREL 2,4,6 SIGNATURE)	15m 28s
config (MINSIZEREL 2,4,6 SIGNATURE LOW)	20m 6s
config (MINSIZEREL 2,4,6 SIGNATURE MEDIUM)	24m 4s
config (MINSIZEREL 8,10 SIGNATURE)	10m 54s
config (MINSIZEREL 8,10 SIGNATURE LOW)	13m 53s
config (MINSIZEREL 8,10 SIGNATURE MEDIUM)	16m 36s
	2h 49m 20s

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