Ubuntu SM Debian Bug Fixes:
1. Added sendmail as dependency
2. Changed wrong sed command
3. Added check for postfix before stopping service

Change-Id: Ia04de174a6c2b70f72eacaec354dd62d9156add5
Merge "Ubuntu SM Debian Bug Fixes: 1. Added sendmail as dependency 2. Changed wrong sed command 3. Added check for postfix before stopping service" into R1.10