Pre salted images from Netmanagers

Note	All develop images need to point to the new upstream master branch instead. We’ll have to work out naming issues, though.

Note	This page will be useful for future planning: https://github.com/saltstack/salt/issues/55009#issue-506814412.

Table 1. Collected on 2019-09-28

		1	2	3	4	5	6	7
		dev py3	dev py2	19.2 py3	19.2 py2	18.3 py3	18.3 py2	17.7 py2	Count	EOL	Rem.
A	debian-10	MPX		___	M--		M--		3	30/06/24	1,737
B	debian-9	U--		UP-	U--		MP-	M--	5	30/06/22	1,006
C	debian-8						U--	UP-	2	30/06/20	276
D	ubuntu-18.04	MP-		MPX	M--		M--		4	30/04/23	1,310
E	ubuntu-1804			U--					1	^	^
F	ubuntu-16.04						MP-	MP-	2	30/04/21	580
G	ubuntu-1604						U--		1	^	^
H	ubuntu-14.04								0	30/04/19	-151
I	centos-8	___		___	___		___		0	30/09/29	3,655
J	centos-7	MP-		MP-	M--		MP-		4	30/06/24	1,737
K	centos-6						M--	MPX	2	30/11/20	429
L	fedora-30	MP-		MP-		___		___	2	31/05/20	246
M	fedora-29	U--		U--	U--	M--	UPX	MP-	6	22/11/19	55
N	fedora-28						U--	U--	2	28/05/19	-123
O	opensuse-leap-15.1	MP-		MP-	M--		MPX	MP-	5	30/11/20	429
P	opensuse-leap-15.0								0	30/11/19	63
Q	opensuse-leap-42						U--	U--	2	01/07/19	-89
R	opensuse-423						U--		1	^	^
S	amazonlinux-2		MP-		MPX		MP-	MP-	4	01/01/23	1,191
T	amazonlinux-1								0	???	???
U	arch-base-latest		MP-		MPX		MP-	MP-	4	---	---
	Count	7	2	7	8	1	15	10	50

Explanation of the 3-character code (e.g. MP-)

1. First character:

   1. M: Maintained

   2. U: Unmaintained

2. Second character:

   1. P: Included in main overall list of platforms used throughout Travis/Cirrus matrices

   2. -: Not included in list of platforms

3. Third character:

   1. X: Included in platforms enabled by default in all matrices

   2. -: Normally commented out in all matrices

4. Special case (___):

   1. Possible/planned upcoming images