Revert "Move /var/log to RAM for Mellanox SN2700, Nokia 7215 and Dell S6100

[assrinivasan]

This reverts commit 05f326e.

Why I did it

Mellanox raised concerns about PR15077. So, we need to revert it.

Work item tracking

• Microsoft ADO 25355843:

How I did it

By calling git revert on commit SHA 05f326e, which is PR #15077 , and fixing merge conflicts on Dell's installer.conf file.

How to verify it

Check that the files modified by aforementioned PR does not have log_inram config.
Build and flash images with this config then verify the following:

Dell S6100

admin@str3-s6100-acs-7:~$ df -h | grep -i '/var/log'
/dev/loop1      3.9G   13M  3.7G   1% /var/log
admin@str3-s6100-acs-7:~$

admin@str3-s6100-acs-7:~$ free -h
               total        used        free      shared  buff/cache   available
Mem:           7.7Gi       1.6Gi       4.8Gi        49Mi       1.4Gi       5.9Gi
Swap:             0B          0B          0B
admin@str3-s6100-acs-7:~$

Mellanox SN2700

admin@str-msn2700-22:~$ df -h | grep -i '/var/log'
/dev/loop1      3.9G  198M  3.5G   6% /var/log
admin@str-msn2700-22:~$

admin@str-msn2700-22:~$ free -h
               total        used        free      shared  buff/cache   available
Mem:           7.7Gi       2.7Gi       3.5Gi       141Mi       1.5Gi       4.7Gi
Swap:             0B          0B          0B
admin@str-msn2700-22:~$

Nokia 7215

admin@str2-7215-acs-1:~$
admin@str2-7215-acs-1:~$  df -h | grep -i '/var/log'
/dev/loop1      3.9G  856K  3.7G   1% /var/log
admin@str2-7215-acs-1:~$

admin@str2-7215-acs-1:~$ free -h
               total        used        free      shared  buff/cache   available
Mem:           3.0Gi       592Mi       1.8Gi       7.0Mi       560Mi       2.3Gi
Swap:             0B          0B          0B
admin@str2-7215-acs-1:~$

Which release branch to backport (provide reason below if selected)

• 201811
• 201911
• 202006
• 202012
• 202106
• 202111
• 202205
• 202211
• 202305

Tested branch (Please provide the tested image version)

Description for the changelog

Link to config_db schema for YANG module changes

A picture of a cute animal (not mandatory but encouraged)

[dgsudharsan]

@assrinivasan @prgeor Can you please add labels to branches where the revert needs to be backported?

[prgeor]

@yxieca @lguohan please merge

[yxieca]

@Blueve Please review the 7215 change. Thanks.

[Blueve]

@yxieca LGTM

[mssonicbld]

Cherry-pick PR to 202205: #16886

[mssonicbld]

Cherry-pick PR to 202305: #16915