CLOUDSTACK-7568, CLOUDSTACK-7569: Use systemctl for managing services in RHEL7. chkconfig --del doesn't work in RHEL7.
Cleaning the README, INSTALL and CHANGES file

(cherry picked from commit 528ac4c6e913b3e39b376965e744714e8496c4be)
Signed-off-by: Rohit Yadav <rohit.yadav@shapeblue.com>

Conflicts:
	INSTALL.md
README: add travis and coverity badges

Signed-off-by: Rohit Yadav <rohit.yadav@shapeblue.com>
CID-1233085: Fix potential NPE in AccountManagerImpl from VpcManagerImpl

Signed-off-by: Rohit Yadav <rohit.yadav@shapeblue.com>
CID-1192805: Remove dead local store from OvsNetworkTopologyGuruImpl

Signed-off-by: Rohit Yadav <rohit.yadav@shapeblue.com>
CID-1192811: Remove dead local store from VolumeJoinDaoImpl

Signed-off-by: Rohit Yadav <rohit.yadav@shapeblue.com>
CID-1192812: Remove dead code from DataCenterJoinDaoImpl

Signed-off-by: Rohit Yadav <rohit.yadav@shapeblue.com>
CID-1199715: Remove dead code from LibvirtStorageAdaptor

Signed-off-by: Rohit Yadav <rohit.yadav@shapeblue.com>
server: remove unused imports that failed build in last run

Signed-off-by: Rohit Yadav <rohit.yadav@shapeblue.com>
CLOUDSTACK-7376 passwd_server attempts to start but terminates with the exit code 137

Signed-off-by: Sheng Yang <sheng.yang@citrix.com>