Increased gas when using paramspace for hardcode params to gov params

[brew0722]

Summary

Problem Definition

As various gov params were taken from paramSpace, the cost of storage gas increased.
It's not a bug, but I found out that there was a cost increase more than I expected while fixing the test case.
There is additional gas consumption as paramSpace getters such as k.getGasMultiplier(...) are called more than 4 times in various APIs such as Inistnatiate, Execute, etc. And these consume 1015 per time.
So, totally more consumed additionally over than 4k when every API called.

Proposal

---

For Admin Use

• Not duplicate issue
• Appropriate labels applied
• Appropriate contributors tagged
• Contributor assigned/self-assigned

[loloicci]

solved by #198.