src/manage_pg.c : fix for gvmd error 'sql: (null)' when initialize the db

[fcolista]

For Alpine, this patch allows gvmd to initialize the db without errors by escaping correctly the percent sign.

This patch address the issue described in: #805

.: Francesco Colista

[timopollmeier]

Thank you for the fix! The patch looks good to me but could you please also add a changelog entry?

[fcolista]

Fixed

• escaping correctly the percent sign in sql statements [src/manage_pg.c : fix for gvmd error 'sql: (null)' when initialize the db #818] (src/manage_pg.c : fix for gvmd error 'sql: (null)' when initialize the db #818)

[bjoernricks]

@fcolista he did mean as a commit to the CHANGELOG.md file