Fix incorrect MOTDs set in Docker resources for WSO2 Stream Processing

[chirangaalwis]

Description:
The MOTD set in Docker resources for WSO2 Stream Processing by default should indicate about running the GA version of WSO2 product servers as these Docker resources are publicly available.

The current MOTDs set in Docker resources indicate about running WSO2 product servers with WSO2 updates. These need to be corrected.

Affected Product Version:
Docker resources for WSO2 Stream Processing v4.4.x and below

Sub Tasks:

• Fixed in Alpine based Docker resources
• Fixed in CentOS based Docker resources
• Code/Peer review