Backport gcc9 and ci option "push demo" [1.1.x]#365

Merged

BulatSaif merged 3 commits intohyperledger-iroha:support/1.1.xfrom BulatSaif:fix/backport-gcc9

Feb 25, 2020

+45-36

Commits on Feb 25, 2020

Infrastructure: replace gcc5 with gcc9, replace Ubuntu 16.04 with 18.04

lebdron
authored and
BulatSaif
committed
Findursa: specify OpenSSL directory

lebdron
authored and
BulatSaif
committed
add option for demo build
BulatSaif
committed