bootutil: Add compressed image flags and TLV, fix misc. bugs in bootutil #2074

Job	Run time
config (RELEASE 2,4,6 SIGNATURE)	9m 11s
config (RELEASE 2,4,6 SIGNATURE LOW)	13m 24s
config (RELEASE 2,4,6 SIGNATURE MEDIUM)	17m 32s
config (RELEASE 8,10 SIGNATURE)	6m 39s
config (RELEASE 8,10 SIGNATURE LOW)	9m 31s
config (RELEASE 8,10 SIGNATURE MEDIUM)	11m 56s
config (MINSIZEREL 2,4,6 SIGNATURE)	15m 14s
config (MINSIZEREL 2,4,6 SIGNATURE LOW)	19m 58s
config (MINSIZEREL 2,4,6 SIGNATURE MEDIUM)	23m 46s
config (MINSIZEREL 8,10 SIGNATURE)	10m 43s
config (MINSIZEREL 8,10 SIGNATURE LOW)	13m 44s
config (MINSIZEREL 8,10 SIGNATURE MEDIUM)	16m 24s
	2h 48m 2s

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