Fixes issue 47 & 48

[WilliamWeiWei]

Issue #, if available: https://github.com/aws-samples/aws-secrets-manager-rotation-lambdas/issues/47 https://github.com/aws-samples/aws-secrets-manager-rotation-lambdas/issues/48

Description of changes: Line#201 - 203 fixes the bug if the GET_GRANTED_DDL contains more than one sql.

Line#302 fixes the bug of failing to connect if the password originally contains @ symbol

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[kboxeth]

Issue #47 was solved by PR #59. We are still investigating issue #48.

[jbct]

Both #47 and #48 have been resolved, closing.