Python3 building

[fan-xin]

• build smart2 in python3 building environment

After investigation, we found that

smart depends on rpm

OE-core is using rpm 5.

rpm 5 has bugs for switching to Python 3
rpm 4 has been switched to Python 3 and used by dnf in Fedora.

OE-core delete the recipe of rpm 4.11, the reason is no power to maintain and buggy.

Then we do the following things.
Clear the bug by upgrading to rpm 4.13.0-rc1
Build rpm 4.13.0-rc1 in OE-core (2 weeks)

Todo

1. Investigae the meaning of 10 patches file which are specified to OE-core (1 week)
   Upstream-Status: Inappropriate [OE-Specific]

2. Test with Smart (2 weeks)

3. Provide our infomation to Yocto Community and engage into the decision of the next package manager.

4. Recovery rpm 4 to OE-Core.

• Test the smart2 which is built in python3 environment
• Investigate whether package which is build by python 2.7 could be merged into Yocto 2.2