Pin rows to the top of the dashboard.

def _ensure_pinned_rows(dashboard):
    '''Pin rows to the top of the dashboard.'''
    pinned_row_titles = __salt__['pillar.get'](_PINNED_ROWS_PILLAR)
    if not pinned_row_titles:
        return

    pinned_row_titles_lower = []
    for title in pinned_row_titles:
        pinned_row_titles_lower.append(title.lower())
    rows = dashboard.get('rows', [])
    pinned_rows = []
    for i, row in enumerate(rows):
        if row.get('title', '').lower() in pinned_row_titles_lower:
            del rows[i]
            pinned_rows.append(row)
    rows = pinned_rows + rows