lib/oe/lsb: attempt to ensure consistent distro id regardless of source

The LSB Distributor ID and os-release NAME differ for most of the
distributions tested by the Yocto Project (CentOS, Debian, Fedora,
openSUSE and Ubuntu) however for all but openSUSE the os-release ID
matches the LSB Distributor ID when both are lowered before
comparison.

Therefore, in order to improve the consistency of identification of
a distribution, switch to using the os-release ID and converting
the ID value to lowercase.

Table showing comparison of LSB Distributor ID to os-release fields NAME
and ID for current Yocto Project supported host distributions:

Distribution | Version | Distributor ID   | NAME             | ID       |
-------------------------------------------------------------------------
CentOS       | 7       | CentOS           | CentOS Linux     | centos   |
Debian       | 8       | Debian           | Debian GNU/Linux | debian   |
Fedora       | 23      | Fedora           | Fedora           | fedora   |
Fedora       | 24      | Fedora           | Fedora           | fedora   |
openSUSE     | 13.2    | openSUSE project | openSUSE         | opensuse |
openSUSE     | 42.1    | SUSE LINUX       | openSUSE Leap    | opensuse |
Ubuntu       | 14.04   | Ubuntu           | Ubuntu           | ubuntu   |
Ubuntu       | 16.04   | Ubuntu           | Ubuntu           | ubuntu   |

[YOCTO #10591]

(From OE-Core rev: 8689e5618d45c2119134ea64754430c06a93ea09)

Signed-off-by: Joshua Lock <joshua.g.lock@intel.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/lib/oe/lsb.py

@@ -10,7 +10,7 @@ def release_dict_osr():
                 key, val = line.rstrip().split('=', 1)
             except ValueError:
                 continue
-            if key == 'NAME':
+            if key == 'ID':
                 data['DISTRIB_ID'] = val.strip('"')
             if key == 'VERSION_ID':
                 data['DISTRIB_RELEASE'] = val.strip('"')
@@ -107,7 +107,7 @@ def distro_identifier(adjust_hook=None):
     distro_id = re.sub(r'\W', '', distro_id)
 
     if release:
-        id_str = '{0}-{1}'.format(distro_id, release)
+        id_str = '{0}-{1}'.format(distro_id.lower(), release)
     else:
         id_str = distro_id
     return id_str.replace(' ','-').replace('/','-')