manage.py cannot handle raspberry pi kernels properly

[Po-Hsu Lin]

The manage.py script cannot handle raspberry pi kernels properly, it will put 4.2 and 4.4 kernel into the same kernel cache file (linux-raspi_kernel):

4.2.0-1028.36
4.2.0-1029.37
4.4.0-1010.11
4.2.0-1030.39
4.4.0-1011.14
4.2.0-1030.39

This is because in the code, we use codenames as part of the file name, like for a bug title with:
"linux: 4.4.0-23.41 -proposed tracker"
It will be parsed as "xenial", because it matches the "linux" (for non-lts) and 4.4 in the string.

But for rapsi2 kernel testing task, the title looks like this:
"linux-raspi2: 4.2.0-1030.39 -proposed tracker"
"linux-raspi2: 4.4.0-1011.14 -proposed tracker"

They all have the same "linux-raspi2" header, we should parse and deal with the following kernel number to get the correct name.

[Po-Hsu Lin (cypressyew)]

MR available here: https://code.launchpad.net/~cypressyew/hwcert-tools/+git/hwcert-tools/+merge/296425

[kaxing (kaxing)]

I got this on the production code:

Traceback (most recent call last):
  File "./hwcert-tools/sru_tools/manage_sru", line 261, in <module>
    sys.exit(main())
  File "./hwcert-tools/sru_tools/manage_sru", line 258, in main
    args.func(**params)
  File "./hwcert-tools/sru_tools/manage_sru", line 78, in notify_kernels
    filename = os.path.expanduser(KERNELS_CACHE) + codename + '_kernel'
TypeError: cannot concatenate 'str' and 'NoneType' objects

For some reason NoneType-codename escape from if-elif statements.
Made a quick fix in production but still got other issue, will take look into this tomorrow.

-- overnight breaker --

So today I figure the latest code from master branch just work, some false indents breaks the if-statements,
however there is another issue, I will just update this bug to fixed released and file another one for "manage_sru status" related problems.