FAB-9043 Prepare fabric for 1.2 developerment
FAB-9043 Prepare fabric for 1.2 developerment

Update BASE_VERSION = 1.2.0, PREV_VERSION = 1.1.0 and
CHAINTOOL_VERSION = 1.1.0

Change-Id: I6913f5c3e4e62d9dff211c77ee3c3e005d3df9f2
Signed-off-by: rameshthoomu <1e6b86b1c013461e7a60f449583642b87c2b3c3b@gmail.com>

manish-sethi/fabric-sidedb,manish-sethi/fabric-sidedb,binhn/fabric,muralisrini/fabric,jimthematrix/fabric,manish-sethi/fabric-sidedb,manish-sethi/fabric-sidedb,manish-sethi/fabric,xixuejia/fabric,manish-sethi/fabric-sidedb,stemlending/fabric,muralisrini/fabric,binhn/fabric,xixuejia/fabric,stemlending/fabric,jimthematrix/fabric,manish-sethi/fabric-sidedb,xixuejia/fabric,manish-sethi/fabric-sidedb,manish-sethi/fabric,stemlending/fabric,hyperledger/fabric,stemlending/fabric,muralisrini/fabric,binhn/fabric,hyperledger/fabric