Infastructure for proper versioning. (#2500)

* each major role change can be recorded in upgrade_roles with a bump in iiab_revision to denote the addition

* test source for https://github.com/iiab/iiab-factory/pull/134

* keep iiab_revision with role name

* gitea

* introduce $INSTALLED_RELEASE $INSTALLED_REVISION into ansible

* set informational 'do_facts'

* 7.1.5-premap tag as starting point for iiab_revision 0

* no notes at all - use underscore for role name to match what is in iiab_state.yml

* use installed_revision trigger do_upgrade

do_reinstall will denote a major upgrade path in the future

scripts/local_facts.fact

@@ -5,8 +5,12 @@
 if [ -f /etc/iiab/iiab.env ]; then
     source /etc/iiab/iiab.env
     STAGE=$STAGE
+    INSTALLED_RELEASE=$IIAB_RELEASE
+    INSTALLED_REVISION=$IIAB_REVISION
 else
     STAGE=0
+    INSTALLED_RELEASE=0
+    INSTALLED_REVISION=0
 fi
 
 OS=`grep ^ID= /etc/*elease|cut -d= -f2`
@@ -84,6 +88,8 @@ SYSD_NETD=`systemctl is-enabled systemd-networkd`
 
 cat <<EOF
 {"phplib_dir"             : "$PHPLIB_DIR",
+"installed_release"       : "$INSTALLED_RELEASE",
+"installed_revision"      : "$INSTALLED_REVISION",
 "stage"                   : "$STAGE",
 "dhcpcd"                  : "$DHCPCD",
 "network_manager"         : "$NM",