refac(ci): improve build time

[juancarlostong]

Summary

Optimizations to the 'Integration tests' triggering build:

• added merge_mode: replace, trigger job only needs to run shell script, so just do that and nothing else.
• added cache: false, caching is used for some *-sdk, this disables it for the 'Integration tests' triggering build since it is not needed.
• replaced after_success: skip with after_success: travis_terminate 0, this avoids running srcclr which saves 18-30s from build time.

[coveralls]

Pull Request Test Coverage Report for Build 815

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 89.77%

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Totals
Change from base Build 807:	0.0%
Covered Lines:	2694
Relevant Lines:	3001

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💛 - Coveralls

[mikeproeng37]

lgtm